Added the system from trail

Editor/EncounterBrowserWindow.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Jovian.EncounterSystem;
+using UnityEditor;
+using UnityEditor.UIElements;
+using UnityEngine;
+using UnityEngine.UIElements;
+
+namespace Jovian.EncounterSystem.Editor {
+    /// <summary>
+    /// Designer-facing browser for every <see cref="IEncounter"/> authored across all
+    /// <see cref="EncounterTable"/> assets in the project. Virtualised ListView on the left,
+    /// property-field detail pane on the right. Search by id/name/description; filter by kind.
+    /// </summary>
+    public class EncounterBrowserWindow : EditorWindow {
+        private const string AllKinds = "All";
+
+        private class Record {
+            public EncounterTable table;
+            public int index;
+            public IEncounter encounter;
+        }
+
+        private readonly List<Record> allRecords = new();
+        private List<Record> filteredRecords = new();
+        private string searchText = string.Empty;
+        private string kindFilter = AllKinds;
+
+        private readonly Dictionary<IEncounter, List<ValidationIssue>> issuesByEncounter = new();
+
+        private ListView listView;
+        private VisualElement detailPane;
+        private ToolbarMenu kindDropdown;
+
+        [MenuItem("Jovian/Encounters/Encounter Browser")]
+        public static void Open() {
+            var window = GetWindow<EncounterBrowserWindow>("Encounters");
+            window.minSize = new Vector2(640, 360);
+        }
+
+        private void CreateGUI() {
+            BuildToolbar();
+            BuildSplit();
+            Refresh();
+        }
+
+        private void BuildToolbar() {
+            var toolbar = new Toolbar();
+
+            var search = new ToolbarSearchField();
+            search.style.flexGrow = 1f;
+            search.RegisterValueChangedCallback(evt => {
+                searchText = evt.newValue ?? string.Empty;
+                ApplyFilter();
+            });
+            toolbar.Add(search);
+
+            kindDropdown = new ToolbarMenu { text = $"Kind: {AllKinds}" };
+            foreach(var choice in GetKindChoices()) {
+                var captured = choice;
+                kindDropdown.menu.AppendAction(captured, _ => {
+                    kindFilter = captured;
+                    kindDropdown.text = $"Kind: {captured}";
+                    ApplyFilter();
+                });
+            }
+            toolbar.Add(kindDropdown);
+
+            var refreshButton = new ToolbarButton(Refresh) { text = "Refresh" };
+            toolbar.Add(refreshButton);
+
+            rootVisualElement.Add(toolbar);
+        }
+
+        private void BuildSplit() {
+            var split = new TwoPaneSplitView(0, 280, TwoPaneSplitViewOrientation.Horizontal);
+            split.style.flexGrow = 1f;
+            rootVisualElement.Add(split);
+
+            listView = new ListView {
+                makeItem = MakeRow,
+                bindItem = BindRow,
+                fixedItemHeight = 22,
+                selectionType = SelectionType.Single
+            };
+            listView.selectionChanged += OnSelectionChanged;
+            listView.style.flexGrow = 1f;
+            split.Add(listView);
+
+            detailPane = new ScrollView(ScrollViewMode.Vertical) {
+                style = { paddingLeft = 8, paddingTop = 8, paddingRight = 8, flexGrow = 1f }
+            };
+            ShowEmptyDetail();
+            split.Add(detailPane);
+        }
+
+        private static VisualElement MakeRow() {
+            var row = new VisualElement {
+                style = {
+                    flexDirection = FlexDirection.Row,
+                    alignItems = Align.Center,
+                    paddingLeft = 6,
+                    paddingRight = 6,
+                    height = 22
+                }
+            };
+
+            var badge = new VisualElement {
+                name = "issue-badge",
+                style = {
+                    width = 8,
+                    height = 8,
+                    marginRight = 6,
+                    borderTopLeftRadius = 4,
+                    borderTopRightRadius = 4,
+                    borderBottomLeftRadius = 4,
+                    borderBottomRightRadius = 4,
+                    visibility = Visibility.Hidden
+                }
+            };
+            row.Add(badge);
+
+            var label = new Label {
+                name = "row-label",
+                style = {
+                    flexGrow = 1f,
+                    unityTextAlign = TextAnchor.MiddleLeft
+                }
+            };
+            row.Add(label);
+
+            return row;
+        }
+
+        private void BindRow(VisualElement element, int index) {
+            var record = filteredRecords[index];
+            var label = element.Q<Label>("row-label");
+            var badge = element.Q<VisualElement>("issue-badge");
+
+            var name = record.encounter?.EncounterDefinition?.name;
+            var kind = record.encounter?.Kind?.GetType().Name ?? "—";
+            label.text = string.IsNullOrEmpty(name)
+                ? $"<unnamed>   [{kind}]"
+                : $"{name}   [{kind}]";
+
+            if(record.encounter != null && issuesByEncounter.TryGetValue(record.encounter, out var issues) && issues.Count > 0) {
+                var hasError = issues.Exists(i => i.severity == ValidationSeverity.Error);
+                badge.style.backgroundColor = new StyleColor(hasError ? new Color(0.85f, 0.25f, 0.25f) : new Color(0.95f, 0.75f, 0.1f));
+                badge.style.visibility = Visibility.Visible;
+                element.tooltip = BuildTooltip(issues);
+            }
+            else {
+                badge.style.visibility = Visibility.Hidden;
+                element.tooltip = string.Empty;
+            }
+        }
+
+        private static string BuildTooltip(List<ValidationIssue> issues) {
+            var lines = new List<string>(issues.Count);
+            foreach(var issue in issues) {
+                var prefix = issue.severity == ValidationSeverity.Error ? "ERROR" : "WARN";
+                lines.Add($"[{prefix}] {issue.path} — {issue.message}");
+            }
+            return string.Join("\n", lines);
+        }
+
+        private static IEnumerable<string> GetKindChoices() {
+            yield return AllKinds;
+
+            var kindTypes = AppDomain.CurrentDomain.GetAssemblies()
+                .SelectMany(assembly => {
+                    try { return assembly.GetTypes(); }
+                    catch { return Array.Empty<Type>(); }
+                })
+                .Where(type => typeof(IEncounterKind).IsAssignableFrom(type) && !type.IsAbstract && !type.IsInterface)
+                .Select(type => type.Name)
+                .OrderBy(name => name);
+
+            foreach(var name in kindTypes) {
+                yield return name;
+            }
+        }
+
+        private void Refresh() {
+            allRecords.Clear();
+
+            var guids = AssetDatabase.FindAssets("t:" + nameof(EncounterTable));
+            foreach(var guid in guids) {
+                var path = AssetDatabase.GUIDToAssetPath(guid);
+                var table = AssetDatabase.LoadAssetAtPath<EncounterTable>(path);
+                if(table?.encounters == null) {
+                    continue;
+                }
+
+                for(int i = 0; i < table.encounters.Count; i++) {
+                    allRecords.Add(new Record {
+                        table = table,
+                        index = i,
+                        encounter = table.encounters[i]
+                    });
+                }
+            }
+
+            RebuildIssueIndex();
+            ApplyFilter();
+        }
+
+        private void RebuildIssueIndex() {
+            issuesByEncounter.Clear();
+            var issues = EncounterValidator.ValidateProject();
+            foreach(var issue in issues) {
+                if(issue.encounter == null) {
+                    continue;
+                }
+                if(!issuesByEncounter.TryGetValue(issue.encounter, out var list)) {
+                    list = new List<ValidationIssue>();
+                    issuesByEncounter[issue.encounter] = list;
+                }
+                list.Add(issue);
+            }
+        }
+
+        private void ApplyFilter() {
+            filteredRecords = allRecords.Where(Matches).ToList();
+            if(listView != null) {
+                listView.itemsSource = filteredRecords;
+                listView.Rebuild();
+                listView.ClearSelection();
+            }
+            ShowEmptyDetail();
+        }
+
+        private bool Matches(Record record) {
+            var kindName = record.encounter?.Kind?.GetType().Name ?? string.Empty;
+            if(kindFilter != AllKinds && kindName != kindFilter) {
+                return false;
+            }
+
+            if(string.IsNullOrEmpty(searchText)) {
+                return true;
+            }
+
+            var needle = searchText.ToLowerInvariant();
+            var definition = record.encounter?.EncounterDefinition;
+            return Contains(definition?.id, needle)
+                || Contains(definition?.name, needle)
+                || Contains(definition?.description, needle);
+        }
+
+        private static bool Contains(string source, string needle) {
+            return !string.IsNullOrEmpty(source) && source.ToLowerInvariant().Contains(needle);
+        }
+
+        private void OnSelectionChanged(IEnumerable<object> selection) {
+            var record = selection.OfType<Record>().FirstOrDefault();
+            if(record == null) {
+                ShowEmptyDetail();
+                return;
+            }
+
+            detailPane.Clear();
+
+            var serializedObject = new SerializedObject(record.table);
+            var encountersProp = serializedObject.FindProperty(nameof(EncounterTable.encounters));
+            var elementProp = encountersProp.GetArrayElementAtIndex(record.index);
+
+            var header = new Label($"{record.table.name}  →  [{record.index}]") {
+                style = {
+                    unityFontStyleAndWeight = FontStyle.Bold,
+                    marginBottom = 6,
+                    color = new StyleColor(new Color(0.75f, 0.75f, 0.75f))
+                }
+            };
+            detailPane.Add(header);
+
+            elementProp.isExpanded = true;
+            var field = new PropertyField(elementProp);
+            field.Bind(serializedObject);
+            detailPane.Add(field);
+
+            AddChainPreviewIfQuest(record);
+        }
+
+        private void AddChainPreviewIfQuest(Record record) {
+            if(record.encounter?.Kind is not QuestKind questKind) {
+                return;
+            }
+
+            var predecessor = FindPredecessor(record.encounter.EncounterDefinition?.internalId);
+            var next = questKind.nextEncounter.Resolve();
+
+            var predName = predecessor?.encounter.EncounterDefinition?.name ?? "—";
+            var currName = record.encounter.EncounterDefinition?.name ?? "<unnamed>";
+            var nextName = next?.EncounterDefinition?.name ?? "—";
+
+            var chainLabel = new Label($"Chain:  {predName}  ←  {currName}  →  {nextName}") {
+                style = {
+                    marginTop = 12,
+                    paddingTop = 6,
+                    paddingBottom = 6,
+                    paddingLeft = 6,
+                    paddingRight = 6,
+                    backgroundColor = new StyleColor(new Color(0.2f, 0.2f, 0.2f, 0.4f)),
+                    unityFontStyleAndWeight = FontStyle.Bold
+                }
+            };
+            detailPane.Add(chainLabel);
+        }
+
+        private Record FindPredecessor(string targetId) {
+            if(string.IsNullOrEmpty(targetId)) {
+                return null;
+            }
+
+            foreach(var record in allRecords) {
+                if(record.encounter?.Kind is not QuestKind kind) {
+                    continue;
+                }
+
+                var next = kind.nextEncounter.Resolve();
+                if(next?.EncounterDefinition?.internalId == targetId) {
+                    return record;
+                }
+            }
+            return null;
+        }
+
+        private void ShowEmptyDetail() {
+            if(detailPane == null) {
+                return;
+            }
+
+            detailPane.Clear();
+            var empty = new Label("Select an encounter to edit.") {
+                style = { color = new StyleColor(Color.gray), marginTop = 8 }
+            };
+            detailPane.Add(empty);
+        }
+    }
+}

Editor/EncounterBrowserWindow.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 0312d015c183e2f4582358d17867585c

Editor/EncounterDrawer.cs

@@ -0,0 +1,81 @@
+using Jovian.EncounterSystem;
+using UnityEditor;
+using UnityEngine;
+
+namespace Jovian.EncounterSystem.Editor {
+    /// <summary>
+    /// Draws each <see cref="Encounter"/> list element with its <see cref="EncounterDefinition.id"/>
+    /// as the foldout label (falling back to <c>name</c>, then the default element label).
+    /// Children are iterated manually to avoid recursing into this drawer.
+    /// </summary>
+    [CustomPropertyDrawer(typeof(Encounter))]
+    public class EncounterDrawer : PropertyDrawer {
+        private const string DefinitionBackingField = "<EncounterDefinition>k__BackingField";
+
+        public override void OnGUI(Rect position, SerializedProperty property, GUIContent label) {
+            var displayLabel = ResolveLabel(property, label);
+
+            var foldoutRect = new Rect(position.x, position.y, position.width, EditorGUIUtility.singleLineHeight);
+            property.isExpanded = EditorGUI.Foldout(foldoutRect, property.isExpanded, displayLabel, true);
+
+            if(!property.isExpanded) {
+                return;
+            }
+
+            EditorGUI.indentLevel++;
+            var y = position.y + EditorGUIUtility.singleLineHeight + EditorGUIUtility.standardVerticalSpacing;
+            var iterator = property.Copy();
+            var end = iterator.GetEndProperty();
+            if(iterator.NextVisible(true)) {
+                while(!SerializedProperty.EqualContents(iterator, end)) {
+                    var h = EditorGUI.GetPropertyHeight(iterator, true);
+                    var r = new Rect(position.x, y, position.width, h);
+                    EditorGUI.PropertyField(r, iterator, true);
+                    y += h + EditorGUIUtility.standardVerticalSpacing;
+                    if(!iterator.NextVisible(false)) {
+                        break;
+                    }
+                }
+            }
+            EditorGUI.indentLevel--;
+        }
+
+        public override float GetPropertyHeight(SerializedProperty property, GUIContent label) {
+            var height = EditorGUIUtility.singleLineHeight;
+            if(!property.isExpanded) {
+                return height;
+            }
+
+            var iterator = property.Copy();
+            var end = iterator.GetEndProperty();
+            if(iterator.NextVisible(true)) {
+                while(!SerializedProperty.EqualContents(iterator, end)) {
+                    height += EditorGUI.GetPropertyHeight(iterator, true) + EditorGUIUtility.standardVerticalSpacing;
+                    if(!iterator.NextVisible(false)) {
+                        break;
+                    }
+                }
+            }
+            return height;
+        }
+
+        private static GUIContent ResolveLabel(SerializedProperty property, GUIContent fallback) {
+            var definition = property.FindPropertyRelative(DefinitionBackingField);
+            if(definition == null) {
+                return fallback;
+            }
+
+            var id = definition.FindPropertyRelative("id")?.stringValue;
+            if(!string.IsNullOrEmpty(id)) {
+                return new GUIContent(id);
+            }
+
+            var name = definition.FindPropertyRelative("name")?.stringValue;
+            if(!string.IsNullOrEmpty(name)) {
+                return new GUIContent(name);
+            }
+
+            return fallback;
+        }
+    }
+}

Editor/EncounterDrawer.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 0ee5ffe2ea6903547ac75470249af31f

Editor/EncounterLinkDrawer.cs

@@ -0,0 +1,86 @@
+using Jovian.EncounterSystem;
+using UnityEditor;
+using UnityEngine;
+
+namespace Jovian.EncounterSystem.Editor {
+    /// <summary>
+    /// Two-row drawer for <see cref="EncounterLink"/>. Row 1 is an asset object-field for the target
+    /// <see cref="EncounterTable"/>; row 2 is a dropdown of encounters inside that table labelled by
+    /// <c>EncounterDefinition.name</c>. Picking a different table clears the stored internalId.
+    /// </summary>
+    [CustomPropertyDrawer(typeof(EncounterLink))]
+    public class EncounterLinkDrawer : PropertyDrawer {
+        private const string NonePlaceholder = "<none>";
+        private const string EmptyTablePlaceholder = "<select a table first>";
+
+        public override void OnGUI(Rect position, SerializedProperty property, GUIContent label) {
+            var tableProp = property.FindPropertyRelative("table");
+            var idProp = property.FindPropertyRelative("internalId");
+
+            EditorGUI.BeginProperty(position, label, property);
+
+            var lineHeight = EditorGUIUtility.singleLineHeight;
+            var spacing = EditorGUIUtility.standardVerticalSpacing;
+
+            var tableRect = new Rect(position.x, position.y, position.width, lineHeight);
+            var encounterRect = new Rect(position.x, position.y + lineHeight + spacing, position.width, lineHeight);
+
+            EditorGUI.BeginChangeCheck();
+            EditorGUI.PropertyField(tableRect, tableProp, label);
+            var tableChanged = EditorGUI.EndChangeCheck();
+
+            using(new EditorGUI.IndentLevelScope()) {
+                var table = tableProp.objectReferenceValue as EncounterTable;
+                if(table == null || table.encounters == null || table.encounters.Count == 0) {
+                    using(new EditorGUI.DisabledScope(true)) {
+                        EditorGUI.Popup(encounterRect, "Encounter", 0, new[] { EmptyTablePlaceholder });
+                    }
+                    if(tableChanged) {
+                        idProp.stringValue = string.Empty;
+                    }
+                }
+                else {
+                    DrawEncounterPicker(encounterRect, table, idProp, tableChanged);
+                }
+            }
+
+            EditorGUI.EndProperty();
+        }
+
+        public override float GetPropertyHeight(SerializedProperty property, GUIContent label) {
+            return EditorGUIUtility.singleLineHeight * 2 + EditorGUIUtility.standardVerticalSpacing;
+        }
+
+        private static void DrawEncounterPicker(Rect rect, EncounterTable table, SerializedProperty idProp, bool tableChanged) {
+            var count = table.encounters.Count;
+            var ids = new string[count + 1];
+            var names = new string[count + 1];
+            ids[0] = string.Empty;
+            names[0] = NonePlaceholder;
+
+            var currentIndex = 0;
+            for(int i = 0; i < count; i++) {
+                var encounter = table.encounters[i];
+                var id = encounter?.EncounterDefinition?.internalId ?? string.Empty;
+                var name = encounter?.EncounterDefinition?.name;
+                ids[i + 1] = id;
+                names[i + 1] = string.IsNullOrEmpty(name)
+                    ? $"<unnamed> ({encounter?.GetType().Name ?? "null"})"
+                    : name;
+                if(!tableChanged && id == idProp.stringValue && !string.IsNullOrEmpty(id)) {
+                    currentIndex = i + 1;
+                }
+            }
+
+            if(tableChanged) {
+                idProp.stringValue = string.Empty;
+                currentIndex = 0;
+            }
+
+            var newIndex = EditorGUI.Popup(rect, "Encounter", currentIndex, names);
+            if(newIndex != currentIndex) {
+                idProp.stringValue = ids[newIndex];
+            }
+        }
+    }
+}

Editor/EncounterLinkDrawer.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 385fe4b7b2663e54aa3f520a809a33bc

Editor/EncounterValidator.cs

@@ -0,0 +1,266 @@
+using System.Collections.Generic;
+using Jovian.EncounterSystem;
+using UnityEditor;
+using UnityEngine;
+
+namespace Jovian.EncounterSystem.Editor {
+    /// <summary>Severity of a <see cref="ValidationIssue"/>.</summary>
+    public enum ValidationSeverity {
+        Warning,
+        Error
+    }
+
+    /// <summary>
+    /// One thing the validator found wrong. <see cref="asset"/> is the click-through target
+    /// (table, dialog option set, reward), <see cref="encounter"/> identifies the specific
+    /// encounter the issue pertains to when applicable, and <see cref="path"/> describes where
+    /// inside the asset the issue lives.
+    /// </summary>
+    public class ValidationIssue {
+        public Object asset;
+        public Encounter encounter;
+        public string path;
+        public ValidationSeverity severity;
+        public string message;
+    }
+
+    /// <summary>
+    /// Scans every <see cref="EncounterTable"/> and <see cref="Reward"/> asset in the project and
+    /// returns the list of issues found. Intended to be driven from a menu item, the browser window,
+    /// or pre-commit tooling. Runs on demand — does not cache.
+    /// </summary>
+    public static class EncounterValidator {
+        /// <summary>Walk every encounter table and reward asset, returning all issues found.</summary>
+        public static List<ValidationIssue> ValidateProject() {
+            var issues = new List<ValidationIssue>();
+
+            var tables = FindAssetsOfType<EncounterTable>();
+            var idIndex = new Dictionary<string, (Encounter encounter, EncounterTable table)>();
+
+            foreach(var table in tables) {
+                ValidateTable(table, issues, idIndex);
+            }
+
+            foreach(var reward in FindAssetsOfType<Reward>()) {
+                ValidateReward(reward, issues);
+            }
+
+            return issues;
+        }
+
+        /// <summary>Return the issues for a single encounter inside a table. Useful for per-row badges.</summary>
+        public static List<ValidationIssue> ValidateEncounter(EncounterTable table, int index) {
+            var issues = new List<ValidationIssue>();
+            if(table?.encounters == null || index < 0 || index >= table.encounters.Count) {
+                return issues;
+            }
+
+            var encounter = table.encounters[index];
+            ValidateEncounterEntry(table, index, encounter, issues, duplicateCheck: null);
+            return issues;
+        }
+
+        private static void ValidateTable(EncounterTable table, List<ValidationIssue> issues, Dictionary<string, (Encounter, EncounterTable)> idIndex) {
+            if(table?.encounters == null) {
+                return;
+            }
+
+            for(int i = 0; i < table.encounters.Count; i++) {
+                ValidateEncounterEntry(table, i, table.encounters[i], issues, idIndex);
+            }
+        }
+
+        private static void ValidateEncounterEntry(EncounterTable table, int index, Encounter encounter, List<ValidationIssue> issues, Dictionary<string, (Encounter, EncounterTable)> duplicateCheck) {
+            var pathPrefix = $"encounters[{index}]";
+
+            if(encounter == null) {
+                issues.Add(new ValidationIssue {
+                    asset = table,
+                    path = pathPrefix,
+                    severity = ValidationSeverity.Error,
+                    message = "Null encounter entry."
+                });
+                return;
+            }
+
+            var definition = encounter.EncounterDefinition;
+            if(definition == null || string.IsNullOrEmpty(definition.internalId)) {
+                issues.Add(new ValidationIssue {
+                    asset = table,
+                    encounter = encounter,
+                    path = $"{pathPrefix}.EncounterDefinition.internalId",
+                    severity = ValidationSeverity.Error,
+                    message = "Missing internalId (cannot be referenced by EncounterLink)."
+                });
+            }
+            else if(duplicateCheck != null) {
+                if(duplicateCheck.TryGetValue(definition.internalId, out var prior)) {
+                    issues.Add(new ValidationIssue {
+                        asset = table,
+                        encounter = encounter,
+                        path = $"{pathPrefix}.EncounterDefinition.internalId",
+                        severity = ValidationSeverity.Error,
+                        message = $"Duplicate internalId '{definition.internalId}' (also in table '{prior.Item2.name}')."
+                    });
+                }
+                else {
+                    duplicateCheck[definition.internalId] = (encounter, table);
+                }
+            }
+
+            if(encounter.Kind == null) {
+                issues.Add(new ValidationIssue {
+                    asset = table,
+                    encounter = encounter,
+                    path = $"{pathPrefix}.Kind",
+                    severity = ValidationSeverity.Warning,
+                    message = "Encounter.Kind is null — pick a kind in the inspector."
+                });
+            }
+
+            if(encounter.Kind is QuestKind questKind) {
+                ValidateEncounterLink(table, pathPrefix + ".Kind.nextEncounter", encounter, questKind.nextEncounter, issues);
+            }
+
+            ValidateDialogEvents(table, index, encounter, issues);
+        }
+
+        private static void ValidateEncounterLink(EncounterTable owningTable, string path, Encounter encounter, EncounterLink link, List<ValidationIssue> issues) {
+            if(link.table == null && string.IsNullOrEmpty(link.internalId)) {
+                return;
+            }
+
+            if(link.table == null) {
+                issues.Add(new ValidationIssue {
+                    asset = owningTable,
+                    encounter = encounter,
+                    path = path,
+                    severity = ValidationSeverity.Error,
+                    message = "EncounterLink has internalId set but no table assigned."
+                });
+                return;
+            }
+
+            if(link.Resolve() == null) {
+                issues.Add(new ValidationIssue {
+                    asset = owningTable,
+                    encounter = encounter,
+                    path = path,
+                    severity = ValidationSeverity.Error,
+                    message = $"Broken EncounterLink — table '{link.table.name}' has no encounter with internalId '{link.internalId}'."
+                });
+            }
+        }
+
+        private static void ValidateDialogEvents(EncounterTable table, int index, Encounter encounter, List<ValidationIssue> issues) {
+            var optionSet = encounter.EncounterDialogOptionSet;
+            if(optionSet?.options == null) {
+                return;
+            }
+
+            for(int o = 0; o < optionSet.options.Count; o++) {
+                var option = optionSet.options[o];
+                if(option?.events == null) {
+                    continue;
+                }
+
+                for(int e = 0; e < option.events.Count; e++) {
+                    var evt = option.events[e];
+                    if(evt == null) {
+                        issues.Add(new ValidationIssue {
+                            asset = optionSet,
+                            encounter = encounter,
+                            path = $"options[{o}].events[{e}]",
+                            severity = ValidationSeverity.Warning,
+                            message = "Null event entry (type may have been renamed/deleted)."
+                        });
+                        continue;
+                    }
+
+                    if(evt is GiveRewardEvent give && give.reward == null) {
+                        issues.Add(new ValidationIssue {
+                            asset = optionSet,
+                            encounter = encounter,
+                            path = $"options[{o}].events[{e}].reward",
+                            severity = ValidationSeverity.Warning,
+                            message = "GiveRewardEvent has no Reward asset assigned."
+                        });
+                    }
+                }
+            }
+        }
+
+        private static void ValidateReward(Reward reward, List<ValidationIssue> issues) {
+            if(reward == null) {
+                return;
+            }
+
+            if(reward.kind == null) {
+                issues.Add(new ValidationIssue {
+                    asset = reward,
+                    path = "kind",
+                    severity = ValidationSeverity.Warning,
+                    message = "Reward.kind is null — pick a reward kind in the inspector."
+                });
+            }
+
+            if(string.IsNullOrEmpty(reward.id)) {
+                issues.Add(new ValidationIssue {
+                    asset = reward,
+                    path = "id",
+                    severity = ValidationSeverity.Warning,
+                    message = "Reward has no id."
+                });
+            }
+        }
+
+        private static List<T> FindAssetsOfType<T>() where T : Object {
+            var result = new List<T>();
+            var guids = AssetDatabase.FindAssets("t:" + typeof(T).Name);
+            foreach(var guid in guids) {
+                var path = AssetDatabase.GUIDToAssetPath(guid);
+                var asset = AssetDatabase.LoadAssetAtPath<T>(path);
+                if(asset != null) {
+                    result.Add(asset);
+                }
+            }
+            return result;
+        }
+    }
+
+    /// <summary>Menu-driven runner that prints the validator report to the console with click-through asset pings.</summary>
+    public static class EncounterValidatorMenu {
+        [MenuItem("Jovian/Encounters/Validate All")]
+        public static void ValidateAll() {
+            var issues = EncounterValidator.ValidateProject();
+            if(issues.Count == 0) {
+                Debug.Log("[EncounterValidator] No issues found.");
+                return;
+            }
+
+            int errors = 0;
+            int warnings = 0;
+            foreach(var issue in issues) {
+                if(issue.severity == ValidationSeverity.Error) {
+                    errors++;
+                }
+                else {
+                    warnings++;
+                }
+            }
+
+            Debug.Log($"[EncounterValidator] {issues.Count} issue(s) found — {errors} error(s), {warnings} warning(s). Click any log row to ping the offending asset.");
+
+            foreach(var issue in issues) {
+                var assetName = issue.asset != null ? issue.asset.name : "<null>";
+                var message = $"[EncounterValidator] {assetName} · {issue.path} — {issue.message}";
+                if(issue.severity == ValidationSeverity.Error) {
+                    Debug.LogError(message, issue.asset);
+                }
+                else {
+                    Debug.LogWarning(message, issue.asset);
+                }
+            }
+        }
+    }
+}

Editor/EncounterValidator.cs.meta

@@ -0,0 +1,2 @@
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+guid: bab1779bc53230a4291cd3ff35774558

Editor/Jovian.EncounterSystem.Editor.asmdef

@@ -0,0 +1,18 @@
+{
+    "name": "Jovian.EncounterSystem.Editor",
+    "rootNamespace": "Jovian.EncounterSystem.Editor",
+    "references": [
+        "Jovian.EncounterSystem"
+    ],
+    "includePlatforms": [
+        "Editor"
+    ],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": [],
+    "versionDefines": [],
+    "noEngineReferences": false
+}

Editor/Jovian.EncounterSystem.Editor.asmdef.meta

@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: fa750d6ecf6f41540ab10d47c136fc33
+AssemblyDefinitionImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Editor/SubclassSelectorDrawer.cs

@@ -0,0 +1,157 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Jovian.EncounterSystem;
+using UnityEditor;
+using UnityEngine;
+
+namespace Jovian.EncounterSystem.Editor {
+    /// <summary>
+    /// Custom drawer for any field marked <c>[SerializeReference, SubclassSelector]</c>. Renders a
+    /// "pick a concrete type" dropdown populated by reflection over the declared base type, then
+    /// draws the chosen instance's serialized children underneath. Works for single fields, arrays,
+    /// and <see cref="List{T}"/> elements.
+    /// </summary>
+    /// <remarks>
+    /// The type cache is a <c>static readonly</c> dictionary; it is implicitly cleared on domain
+    /// reload because the static field is recreated with the new assembly image.
+    /// </remarks>
+    [CustomPropertyDrawer(typeof(SubclassSelectorAttribute))]
+    public class SubclassSelectorDrawer : PropertyDrawer {
+        private static readonly Dictionary<Type, Type[]> TypeCache = new();
+
+        public override void OnGUI(Rect position, SerializedProperty property, GUIContent label) {
+            if(property.propertyType != SerializedPropertyType.ManagedReference) {
+                EditorGUI.LabelField(position, label.text, "[SubclassSelector] requires [SerializeReference]");
+                return;
+            }
+
+            var baseType = ResolveBaseType(fieldInfo.FieldType);
+            var concreteTypes = GetConcreteTypes(baseType);
+            var currentType = GetCurrentType(property);
+            var currentIndex = Array.IndexOf(concreteTypes, currentType);
+
+            var names = new string[concreteTypes.Length + 1];
+            names[0] = "<None>";
+            for(int i = 0; i < concreteTypes.Length; i++) {
+                names[i + 1] = concreteTypes[i].Name;
+            }
+
+            var displayLabel = ResolveDisplayLabel(property, label);
+            var headerRect = new Rect(position.x, position.y, position.width, EditorGUIUtility.singleLineHeight);
+            var labelRect = new Rect(headerRect.x, headerRect.y, EditorGUIUtility.labelWidth, headerRect.height);
+            var popupRect = new Rect(headerRect.x + EditorGUIUtility.labelWidth, headerRect.y, headerRect.width - EditorGUIUtility.labelWidth, headerRect.height);
+
+            EditorGUI.LabelField(labelRect, displayLabel);
+            var newIndex = EditorGUI.Popup(popupRect, currentIndex + 1, names);
+            if(newIndex != currentIndex + 1) {
+                property.managedReferenceValue = newIndex == 0 ? null : Activator.CreateInstance(concreteTypes[newIndex - 1]);
+                property.serializedObject.ApplyModifiedProperties();
+            }
+
+            if(property.managedReferenceValue == null) {
+                return;
+            }
+
+            EditorGUI.indentLevel++;
+            var y = position.y + EditorGUIUtility.singleLineHeight + EditorGUIUtility.standardVerticalSpacing;
+            var iterator = property.Copy();
+            var end = iterator.GetEndProperty();
+            if(iterator.NextVisible(true)) {
+                while(!SerializedProperty.EqualContents(iterator, end)) {
+                    var h = EditorGUI.GetPropertyHeight(iterator, true);
+                    var r = new Rect(position.x, y, position.width, h);
+                    EditorGUI.PropertyField(r, iterator, true);
+                    y += h + EditorGUIUtility.standardVerticalSpacing;
+                    if(!iterator.NextVisible(false)) {
+                        break;
+                    }
+                }
+            }
+            EditorGUI.indentLevel--;
+        }
+
+        public override float GetPropertyHeight(SerializedProperty property, GUIContent label) {
+            var height = EditorGUIUtility.singleLineHeight;
+            if(property.propertyType != SerializedPropertyType.ManagedReference || property.managedReferenceValue == null) {
+                return height;
+            }
+
+            var iterator = property.Copy();
+            var end = iterator.GetEndProperty();
+            if(iterator.NextVisible(true)) {
+                while(!SerializedProperty.EqualContents(iterator, end)) {
+                    height += EditorGUI.GetPropertyHeight(iterator, true) + EditorGUIUtility.standardVerticalSpacing;
+                    if(!iterator.NextVisible(false)) {
+                        break;
+                    }
+                }
+            }
+            return height;
+        }
+
+        private static Type ResolveBaseType(Type fieldType) {
+            if(fieldType.IsArray) {
+                return fieldType.GetElementType();
+            }
+            if(fieldType.IsGenericType && fieldType.GetGenericTypeDefinition() == typeof(List<>)) {
+                return fieldType.GetGenericArguments()[0];
+            }
+            return fieldType;
+        }
+
+        private static Type[] GetConcreteTypes(Type baseType) {
+            if(TypeCache.TryGetValue(baseType, out var cached)) {
+                return cached;
+            }
+
+            var types = AppDomain.CurrentDomain.GetAssemblies()
+                .SelectMany(assembly => {
+                    try {
+                        return assembly.GetTypes();
+                    }
+                    catch {
+                        return Array.Empty<Type>();
+                    }
+                })
+                .Where(type => baseType.IsAssignableFrom(type)
+                    && !type.IsAbstract
+                    && !type.IsInterface
+                    && !typeof(UnityEngine.Object).IsAssignableFrom(type)
+                    && type.GetConstructor(Type.EmptyTypes) != null)
+                .OrderBy(type => type.Name)
+                .ToArray();
+            TypeCache[baseType] = types;
+            return types;
+        }
+
+        private static GUIContent ResolveDisplayLabel(SerializedProperty property, GUIContent fallback) {
+            var value = property.managedReferenceValue;
+            if(value is not IEncounter) {
+                return fallback;
+            }
+
+            var definitionProp = value.GetType().GetProperty("EncounterDefinition");
+            var definition = definitionProp?.GetValue(value);
+            var nameField = definition?.GetType().GetField("name");
+            var name = nameField?.GetValue(definition) as string;
+            return string.IsNullOrEmpty(name) ? fallback : new GUIContent(name);
+        }
+
+        private static Type GetCurrentType(SerializedProperty property) {
+            var full = property.managedReferenceFullTypename;
+            if(string.IsNullOrEmpty(full)) {
+                return null;
+            }
+
+            var space = full.IndexOf(' ');
+            if(space < 0) {
+                return null;
+            }
+
+            var assembly = full.Substring(0, space);
+            var typeName = full.Substring(space + 1);
+            return Type.GetType($"{typeName}, {assembly}");
+        }
+    }
+}

Editor/SubclassSelectorDrawer.cs.meta

@@ -0,0 +1,2 @@
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+guid: 5e00ec3e6bdfd024aa73689289578192