Originally posted by Helen Keller:

All I can think of is if someone's trying to farm a trophy from larger critters. I saw a 2-star troll once. HUGE NOPE.
I'm supposing that's what the obliterator is for, though while I have the mats for it, I haven't bothered making one yet.

Edit: to clarify, OP didn't specifically mention summoning trophies. I'm fine with those spawning like crazy. I can just discard them.