Immediate Crash when casting anything near Chimera boss in Wetlands

So I have tested this a few times - I can cast spells normally up until the boss; however strangely enough ANY town portal beyond the start will immediately crash me. It also rolls back my character, but not the instance. As soon as I approach the boss, casting anything causes me to disconnect immediately as well. Frustrating as everything else seemed alright, but this will prevent me from getting my full ascendency