Weird. It wasn't on the list of affixes on the bestiary page. Man, I wish I had the beta when the molten/etc affixes were in. Would make things a ton more interesting.
I removed it from the list, but I kept the old page around in case they bring it back.
Actually, it sounds like Illusionist is still in the game.. and quite deadly if you think about it: https://twitter.com/#!/Angryrobotics/status/179738567180955648