Multiple stacks of Retch on the ground have disminishing returns on the...

Multiple stacks of Retch on the ground have disminishing returns on the healing; to alleviate NPC necromancers summoning lots of ghouls and being basically on infinite regen mode :)

game/modules/tome/data/damage_types.lua

@@ -2612,7 +2612,14 @@ newDamageType{
 		end
 
 		if target and (target:attr("undead") or target:attr("retch_heal")) then
-			target:heal(dam * 1.5, src)
+			local mult = 1
+			if target.turn_procs and target.turn_procs.been_retched then
+				mult = 0.5 ^ target.turn_procs.been_retched
+			end
+			target:heal(dam * 1.5 * mult, src)
+			if target.turn_procs then
+				target.turn_procs.been_retched = (target.turn_procs.been_retched or 0) + 1
+			end
 
 			if src.callTalent then
 				if rng.percent(src:callTalent(src.T_RETCH, "getPurgeChance")) then