diff --git a/KIOUHook.h b/KIOUHook.h
index c54547d..2c7343b 100644
--- a/KIOUHook.h
+++ b/KIOUHook.h
@@ -40,7 +40,15 @@
 
 // Single observer-dispatcher slot. Every CAVE_OBSERVER cave loads this
 // pointer, BLRs it with W6 = hook_id, and routes through dispatch_one.
-#define KIOU_HOOK_OBSERVER_SLOT_RVA            0x8F90C80
+//
+// Placement: sits inside __DATA.__common just past the entry-slot table
+// capacity (ENTRY_SLOT_BASE_RVA + ENTRY_SLOT_CAPACITY * 8 = 0x091E92B8).
+// The old 0x8F90C80 landed in __DATA.__bss, which UnityRuntime / il2cpp
+// overwrites during lazy init — publishing dispatch_one there survived
+// startup but got clobbered before the first observer fire, so the cave
+// BLR X16 jumped to garbage and crashed with a PC alignment fault. See
+// recipes/v1_0_2.py for the __common vs __bss note.
+#define KIOU_HOOK_OBSERVER_SLOT_RVA            0x091E92B8
 
 // Entry-cave slot table. Slot N at +N*8 holds the function pointer the
 // CAVE_ENTRY cave BLRs directly (no dispatcher).
diff --git a/recipes/__init__.py b/recipes/__init__.py
index 8541a59..1fdeaeb 100644
--- a/recipes/__init__.py
+++ b/recipes/__init__.py
@@ -60,6 +60,9 @@
 assert _v.ENTRY_SLOT_BASE_RVA + ENTRY_SLOT_CAPACITY * 8 <= _v.ZERO_REGION_END_RVA, (
     f"entry slot reservation overflows verified-zero region for {_target_version}"
 )
+assert _v.HOOK_SLOT_RVA + 8 <= _v.ZERO_REGION_END_RVA, (
+    f"observer slot placement overflows verified-zero region for {_target_version}"
+)
 
 CAVE_REGION                   = _v.CAVE_REGION
 HOOK_SLOT_RVA                 = _v.HOOK_SLOT_RVA
diff --git a/recipes/v1_0_1.py b/recipes/v1_0_1.py
index 364d70c..4981c3c 100644
--- a/recipes/v1_0_1.py
+++ b/recipes/v1_0_1.py
@@ -15,7 +15,10 @@
 BUILD = 11
 
 CAVE_REGION         = (0x8268024, 0x826C000)
-HOOK_SLOT_RVA       = 0x8F90C80
+# See v1_0_2 for the rationale: 0x8F90C80 (__DATA.__bss) is unstable —
+# UnityRuntime overwrites it after KIOUChinlanPublish. Move to __common
+# right after the entry-slot table capacity, where publishes survive.
+HOOK_SLOT_RVA       = 0x091E92B8
 PROBED_HOOK_SLOT_RVA = HOOK_SLOT_RVA
 
 INJECT_ENTRY_TABLE_RVA        = 0x8F90C00
diff --git a/recipes/v1_0_2.py b/recipes/v1_0_2.py
index 3563bc4..f53627a 100644
--- a/recipes/v1_0_2.py
+++ b/recipes/v1_0_2.py
@@ -11,7 +11,11 @@
 CAVE_REGION         = (0x826F5E8, 0x8274000)
 
 # Observer dispatcher slot — chinlan caves load this single 8-byte pointer.
-HOOK_SLOT_RVA       = 0x8F90C80
+# Sits just past the entry-slot table inside __DATA.__common. The old
+# 0x8F90C80 landed in __DATA.__bss, which il2cpp/UnityRuntime overwrites
+# during lazy init (verified crash: cave BLR X16 jumped to garbage after
+# publish). __common survives publish — entry slots (0x091E91B8..) do.
+HOOK_SLOT_RVA       = 0x091E92B8
 PROBED_HOOK_SLOT_RVA = HOOK_SLOT_RVA
 
 # Entry-cave slot table — ENTRY_SLOT_BASE_RVA + idx*8 holds each hook fn ptr.