The following armor dropped off a sulphuric ghoul in muspelheim while I was farming them to see if I could get some caustic armor that is alleged to drop off them. Sulphuric ghouls only spawn one place in Muspelheim, they are a night spawn mob, and you only get 6-8 of them to pop in any given evening (one game day is about one RL hour). I got the following drop after about 6 or 7 game nights of farming. No other drops have been seen in another 10 or 12 game nights of farming.
||Acid Etched Studded