diff --git a/src/simulator/api-gdext/src/lib.rs b/src/simulator/api-gdext/src/lib.rs
index 3681d68a..37c79902 100644
--- a/src/simulator/api-gdext/src/lib.rs
+++ b/src/simulator/api-gdext/src/lib.rs
@@ -1625,6 +1625,16 @@ impl GdGameState {
             .unwrap_or(0)
     }
 
+    /// Directly set the turn counter. Used by the iter 7k GDScript adapter
+    /// to seed the deterministic RNG from the live `GameState.turn_number`
+    /// so each real game turn produces a different encounter roll stream.
+    /// Without this, a rebuild-state-per-call pattern always starts with
+    /// `state.turn = 0` and produces identical RNG draws.
+    #[func]
+    fn set_turn(&mut self, turn: i64) {
+        self.inner.turn = turn.clamp(0, u32::MAX as i64) as u32;
+    }
+
     /// Total lair count in the attached grid (all tiers).
     #[func]
     fn lair_count(&self) -> i64 {