diff --git a/lib/providers/user_preferences_provider.dart b/lib/providers/user_preferences_provider.dart
index a3542ac9..8712a57b 100644
--- a/lib/providers/user_preferences_provider.dart
+++ b/lib/providers/user_preferences_provider.dart
@@ -286,6 +286,8 @@ class MapThemeProfilesProvider extends Notifier<MapThemeProfilesState> {
   static const String immutableDefaultProfileId = 'immutable-default-map-theme';
   static const String immutableValorantProfileId =
       'immutable-valorant-map-theme';
+  static const String immutableLotusMossProfileId =
+      'immutable-lotus-moss-map-theme';
   static const String appPreferencesSingletonKey = 'app_preferences';
   static const int customProfilesSoftCap = 10;
 
@@ -315,9 +317,25 @@ class MapThemeProfilesProvider extends Notifier<MapThemeProfilesState> {
     isBuiltIn: true,
   );
 
+  static final MapThemePalette immutableLotusMossPalette = MapThemePalette(
+    baseColorValue: 0xFF18221A,
+    detailColorValue: 0xFF7FA36B,
+    highlightColorValue: 0xFFE3C567,
+  );
+
+  static final MapThemeProfile immutableLotusMossProfile = MapThemeProfile(
+    id: immutableLotusMossProfileId,
+    name: 'Lotus Moss',
+    palette: immutableLotusMossPalette,
+    isBuiltIn: true,
+  );
+
+  /// Every store gets each of these on launch ([bootstrap] writes any that
+  /// are missing), so adding one here ships it to existing users too.
   static final List<MapThemeProfile> immutableBuiltInProfiles = [
     immutableDefaultProfile,
     immutableValorantProfile,
+    immutableLotusMossProfile,
   ];
 
   @override
diff --git a/test/lotus_moss_builtin_test.dart b/test/lotus_moss_builtin_test.dart
new file mode 100644
index 00000000..5135cb0c
--- /dev/null
+++ b/test/lotus_moss_builtin_test.dart
@@ -0,0 +1,117 @@
+import 'dart:io';
+
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:hive_ce/hive.dart';
+import 'package:icarus/const/hive_boxes.dart';
+import 'package:icarus/hive/hive_registration.dart';
+import 'package:icarus/providers/user_preferences_provider.dart';
+
+void main() {
+  late Directory tempDir;
+
+  setUpAll(() {
+    registerIcarusAdapters(Hive);
+  });
+
+  setUp(() async {
+    tempDir = await Directory.systemTemp.createTemp('icarus-lotus-moss-');
+    Hive.init(tempDir.path);
+    await Hive.openBox<MapThemeProfile>(HiveBoxNames.mapThemeProfilesBox);
+    await Hive.openBox<AppPreferences>(HiveBoxNames.appPreferencesBox);
+  });
+
+  tearDown(() async {
+    await Hive.close();
+    if (await tempDir.exists()) await tempDir.delete(recursive: true);
+  });
+
+  test('a store from before Lotus Moss gains it at launch and keeps the rest',
+      () async {
+    // What a 4.6.3 store holds: the two older built-ins, a custom profile,
+    // and that custom profile as the default for new strategies.
+    final profiles =
+        Hive.box<MapThemeProfile>(HiveBoxNames.mapThemeProfilesBox);
+    final custom = MapThemeProfile(
+      id: 'custom-id',
+      name: 'Tournament',
+      palette: MapThemePalette(
+        baseColorValue: 0xFF0F172A,
+        detailColorValue: 0xFF38BDF8,
+        highlightColorValue: 0xFFF97316,
+      ),
+      isBuiltIn: false,
+    );
+    await profiles.putAll({
+      MapThemeProfilesProvider.immutableDefaultProfileId:
+          MapThemeProfilesProvider.immutableDefaultProfile,
+      MapThemeProfilesProvider.immutableValorantProfileId:
+          MapThemeProfilesProvider.immutableValorantProfile,
+      custom.id: custom,
+    });
+    await Hive.box<AppPreferences>(HiveBoxNames.appPreferencesBox).put(
+      MapThemeProfilesProvider.appPreferencesSingletonKey,
+      AppPreferences(defaultThemeProfileIdForNewStrategies: custom.id),
+    );
+
+    await MapThemeProfilesProvider.bootstrap();
+
+    final lotus =
+        profiles.get(MapThemeProfilesProvider.immutableLotusMossProfileId)!;
+    expect(lotus.name, 'Lotus Moss');
+    expect(lotus.isBuiltIn, isTrue);
+    expect(lotus.palette, MapThemeProfilesProvider.immutableLotusMossPalette);
+    expect(profiles.get(custom.id)!.palette, custom.palette);
+
+    final container = ProviderContainer();
+    addTearDown(container.dispose);
+    final state = container.read(mapThemeProfilesProvider);
+    expect(
+      state.profiles.map((profile) => profile.name),
+      ['Default', 'Valorant', 'Lotus Moss', 'Tournament'],
+    );
+    expect(state.defaultProfileIdForNewStrategies, custom.id);
+  });
+
+  test('Lotus Moss is a built-in: it cannot be renamed, recolored, or deleted',
+      () async {
+    await MapThemeProfilesProvider.bootstrap();
+    final container = ProviderContainer();
+    addTearDown(container.dispose);
+    final notifier = container.read(mapThemeProfilesProvider.notifier);
+    const id = MapThemeProfilesProvider.immutableLotusMossProfileId;
+
+    expect(
+        await notifier.renameProfile(profileId: id, newName: 'Moss'), isFalse);
+    expect(
+      await notifier.updateProfilePalette(
+        profileId: id,
+        palette: MapThemeProfilesProvider.immutableDefaultPalette,
+      ),
+      isFalse,
+    );
+    await notifier.deleteProfile(id);
+
+    final lotus = container
+        .read(mapThemeProfilesProvider)
+        .profiles
+        .singleWhere((profile) => profile.id == id);
+    expect(lotus.name, 'Lotus Moss');
+    expect(lotus.palette, MapThemeProfilesProvider.immutableLotusMossPalette);
+  });
+
+  test('a strategy set to Lotus Moss draws in its colors', () async {
+    await MapThemeProfilesProvider.bootstrap();
+    final container = ProviderContainer();
+    addTearDown(container.dispose);
+
+    container.read(strategyThemeProvider.notifier).fromStrategy(
+          profileId: MapThemeProfilesProvider.immutableLotusMossProfileId,
+        );
+
+    expect(
+      container.read(effectiveMapThemePaletteProvider),
+      MapThemeProfilesProvider.immutableLotusMossPalette,
+    );
+  });
+}