So I just used a Mysterious Sack since I was out of space and I summoned a Lupin Pig! This was my second time summoning it and when I killed it, it dropped this stupid belt. o.o
Waaaay back 3-4 months ago, I was Balrog PQing at least 5 times a day (with my partner SK1033, we've tried 7 times a day) and we found this at the bonus stage once. :) It wasn't our first Bain either, I recall this our 3rd or 4th! We never found any