diff --git a/docs/app-profiles/ghostlight.md b/docs/app-profiles/ghostlight.md
new file mode 100644
index 0000000..7d433f4
--- /dev/null
+++ b/docs/app-profiles/ghostlight.md
@@ -0,0 +1,25 @@
+# Ghostlight Dungeon Access Profile
+
+Ghostlight Dungeon reuses Heimdall's browser-completion Discord sign-in path.
+Heimdall owns provider OAuth, local account identity, signed access claims, and
+refresh. Ghostlight verifies claims locally and owns campaigns, campaign
+membership, current campaign selection, and every world mutation.
+
+## App identity
+
+- `app_slug`: `ghostlight`
+- public URL: `https://yggdrasil.gamecult.org/ghostlight/`
+- identity provider: Discord
+- public-demo rule: any Heimdall-authenticated Discord identity receives
+  `app_access`; no GameCult guild role is required
+
+## Capabilities
+
+- `app_access`: shared capability granting entry to the demo
+- `campaign_play`: hybrid capability; Ghostlight must also prove that the
+  authenticated account owns the selected campaign
+
+The browser never carries provider tokens. It receives a one-time completion
+code, Ghostlight redeems it server-to-server, verifies the resulting
+`aud=ghostlight` claim against Heimdall JWKS, and establishes app-local campaign
+authority.
diff --git a/src/app-profiles.ts b/src/app-profiles.ts
index e5b0c70..0666f90 100644
--- a/src/app-profiles.ts
+++ b/src/app-profiles.ts
@@ -197,11 +197,38 @@ const bifrostProfile: AppProfile = {
   },
 };
 
+const ghostlightProfile: AppProfile = {
+  slug: "ghostlight",
+  displayName: "Ghostlight Dungeon",
+  profileVersion: "2026-08-19",
+  identityProviders: ["discord"],
+  entitlementSources: [],
+  managedConnectionProviders: [],
+  capabilities: [
+    {
+      key: "app_access",
+      mode: "shared",
+      summary: "May enter the public Ghostlight Dungeon demo.",
+      sharedRule: identityFacts.authenticated,
+    },
+    {
+      key: "campaign_play",
+      mode: "hybrid",
+      summary: "May play campaigns owned by the authenticated Ghostlight account.",
+      localRequirement: "Ghostlight must combine app_access with local campaign ownership.",
+    },
+  ],
+  evaluateSharedCapabilities(context) {
+    return context.facts.has(identityFacts.authenticated) ? ["app_access"] : [];
+  },
+};
+
 export const appProfiles: Record<AppSlug, AppProfile> = {
   repixelizer: repixelizerProfile,
   streampixels: streampixelsProfile,
   spotiverse: spotiverseProfile,
   bifrost: bifrostProfile,
+  ghostlight: ghostlightProfile,
 };
 
 export function getAppProfile(appSlug: AppSlug): AppProfile {
diff --git a/src/contracts.ts b/src/contracts.ts
index df03b00..cbfb211 100644
--- a/src/contracts.ts
+++ b/src/contracts.ts
@@ -2,7 +2,7 @@ export const providers = ["discord", "patreon", "github", "twitch", "youtube", "
 
 export type Provider = (typeof providers)[number];
 
-export const appSlugs = ["repixelizer", "streampixels", "spotiverse", "bifrost"] as const;
+export const appSlugs = ["repixelizer", "streampixels", "spotiverse", "bifrost", "ghostlight"] as const;
 
 export type AppSlug = (typeof appSlugs)[number];
 
diff --git a/tests/verse-runtime.test.ts b/tests/verse-runtime.test.ts
index b009592..7c1b05a 100644
--- a/tests/verse-runtime.test.ts
+++ b/tests/verse-runtime.test.ts
@@ -37,7 +37,7 @@ describe("Heimdall verse runtime publication", () => {
       runtime: {
         storageBackend: "postgres",
         configuredProviders: ["discord", "twitch"],
-        appProfileCount: 4,
+        appProfileCount: 5,
       },
     });
     expect(bySchema.get("heimdall.command_boundary.v1")).toMatchObject({
@@ -56,7 +56,7 @@ describe("Heimdall verse runtime publication", () => {
     expect(bySchema.get("idunn.daemon_health")).toEqual([
       "yggdrasil-heimdall",
       "active",
-      "Heimdall auth runtime active; storage=postgres; providers=2/6; apps=4; healthTransport=CultNet/RUDP",
+      "Heimdall auth runtime active; storage=postgres; providers=2/6; apps=5; healthTransport=CultNet/RUDP",
       "2026-06-16T17:10:00.000Z",
       "heimdall.cultnet-rudp-provider-health",
       "daemon-published",
diff --git a/tests/verse-witness.test.ts b/tests/verse-witness.test.ts
index cd91132..e3d9c31 100644
--- a/tests/verse-witness.test.ts
+++ b/tests/verse-witness.test.ts
@@ -37,6 +37,7 @@ describe("Heimdall Verse witness advertisement", () => {
       "streampixels",
       "spotiverse",
       "bifrost",
+      "ghostlight",
     ]);
     expect(advertisement.documents.map((document) => document.schemaId)).toEqual([...heimdallWitnessSchemaIds]);
   });