4Game

I went through Black Forest and Swamp without seeing a single Rancid Remains. Would be cool for enemy variety for one.

And (Minor spoiler):

You need one of their trophies for one of the Misltands gear. But you don't even get a recipe until you get a trophy, even if you have all the other ingriedients and crafting station. If I didn't see it on reddit, I would have never even thought it exists. So I searched on valpedia and found what I need for it.

I raided crypts like mad and still never found a single one. And it has only a 10% chance to drop a trophy.

They do spawn during the skeleton suprise raid, but it may trigger, may not, and they may not drop it anyway.

So either in BF Crypts or Swamp more Big Spooky Boys would be appriciated.