diff --git a/language.version b/language.version
index ae384fdfd..6802fb1b9 100644
--- a/language.version
+++ b/language.version
@@ -1,3 +1,3 @@
 [default]
-SWWM_MODVER="\cyDEMOLITIONIST \cw1.3pre r1205 \cu(dom 16 mar 2025 21:02:13 CET)\c-";
-SWWM_SHORTVER="\cw1.3pre r1205 \cu(2025-03-16 21:02:13)\c-";
+SWWM_MODVER="\cyDEMOLITIONIST \cw1.3pre r1206 \cu(mar 18 mar 2025 22:44:17 CET)\c-";
+SWWM_SHORTVER="\cw1.3pre r1206 \cu(2025-03-18 22:44:17)\c-";
diff --git a/terrain.txt b/terrain.txt
index ab3c9a20b..c606b08da 100644
--- a/terrain.txt
+++ b/terrain.txt
@@ -733,3 +733,10 @@ floor optional EQNXSL01 Mud
 floor optional EQNXSL02 Mud
 floor optional EQNXSL03 Mud
 floor optional EQNXSL04 Mud
+
+
+// [MK] Sunder "muck"
+floor optional MUCK_1 Mud
+floor optional MUCK_2 Mud
+floor optional MUCK_3 Mud
+floor optional MUCK_4 Mud