Horsefly Swamp update

Creatures & encounter tables to support Horsefly swamp expansion.

_module/nss/cold_aura1.nss

@@ -0,0 +1,14 @@
+void main()
+{
+    object oTarget = GetEnteringObject();
+    object oCaster = GetAreaOfEffectCreator();
+
+    if ( !GetIsEnemy(oTarget,oCaster) || oTarget == oCaster )
+        return;
+
+    effect eAcid = EffectDamage(d6(2),DAMAGE_TYPE_COLD);
+    effect eVis = EffectVisualEffect(VFX_IMP_FROST_S);
+
+    ApplyEffectToObject(DURATION_TYPE_INSTANT,eAcid,oTarget);
+    ApplyEffectToObject(DURATION_TYPE_INSTANT,eVis,oTarget);
+}