I have killed at least 50 calcified skeletons so far, and have yet to see a humerous. I've seen at least a dozen ribcages, a foot bone, and a skull... but no darn humerous. No wonder this site doesn't have a listing for the Berserker tunic yet....
All the other Troll Berserker pieces I had by level 7, and I gained 2 levels killing dark blue calcified skeletons... slow way to go.