diff --git a/mod/slugbase/jillo.json b/mod/slugbase/jillo.json
index 2fca346..ceab8b9 100644
--- a/mod/slugbase/jillo.json
+++ b/mod/slugbase/jillo.json
@@ -37,6 +37,7 @@
 		"world_state": "Spear",
 
 		"jillo/bounce": 0.6,
-		"jillo/immune_to_dart_maggots": true
+		"jillo/immune_to_dart_maggots": true,
+		"jillo/has_mark": true
 	}
 }
\ No newline at end of file
diff --git a/src/Plugin.cs b/src/Plugin.cs
index 460c668..c00f102 100644
--- a/src/Plugin.cs
+++ b/src/Plugin.cs
@@ -18,6 +18,7 @@ class Plugin : BaseUnityPlugin {
 
             BounceFeature.AddHooks();
             ImmuneToDartMaggotsFeature.AddHooks();
+            MarkFeature.AddHooks();
         } catch (Exception err) {
             Logger.LogError($"error initializing: {err}");
         }
diff --git a/src/features/MarkFeature.cs b/src/features/MarkFeature.cs
new file mode 100644
index 0000000..3007dce
--- /dev/null
+++ b/src/features/MarkFeature.cs
@@ -0,0 +1,21 @@
+using SlugBase.Features;
+using static SlugBase.Features.FeatureTypes;
+using SlugBase;
+
+namespace JilloSlug;
+
+internal static class MarkFeature {
+    public static readonly PlayerFeature<bool> Mark = PlayerBool("jillo/has_mark");
+
+    public static void AddHooks() {
+        On.SaveState.ctor += SaveState_ctor;
+    }
+
+    private static void SaveState_ctor(On.SaveState.orig_ctor orig, SaveState self, SlugcatStats.Name slugcat, PlayerProgression progression) {
+        orig(self, slugcat, progression);
+
+        if (SlugBaseCharacter.TryGet(slugcat, out var chara) && Mark.TryGet(chara, out bool hasMark) && hasMark) {
+            self.deathPersistentSaveData.theMark = true;
+        }
+    }
+}