Thanks for the help guys! and all the detailed input ten hex!

I'm kind of bumbling around in the dark on this one. (if you couldn't tell)
Actually recent study has shown that wolverines aren't antisocial so much as just very territorial, so while it fits your meaning against the +2 beast spirits. (unless it's a territory thing or sharing the food.

) they get along with each other very well and even humans if they know them fairly well, for instance a man in Alaska has been raising/rehabilitating several wolverines in captivity for over 10 years while regularly interacting with them on a daily basis (playing, going on walks, feeding, etc) all without an aggressive/hostile incident over that 10 year span. (SHOCKING! I know!)
I'm against the notion that a wolverine would go necessary berserk, I think it would be more accurate to say that they would have more trouble backing out of a fight by backing down before it started than picking a time to let someone go while still hold a favorable position in said fight. I've seen via video of their interactions in the wild when fighting with other animals to pick and choose their fights and the length, once they feel they've made their point they'll stand off and wait to see if their enemy wants more, but when threatened they'll charge right in, sort of like a wolf's negative, except to back down from a conflict that isn't a fight yet.
say for instance?
+2 intimidation +2 combat spells
- a wolverine magician must succeed a wil+cha test (3) to back down from starting a fight when threatened/challenged
The extra positives and negatives I wanted to take mostly to be different from other mentor spirits and to flesh this one out more as it has to me some very strong survival traits that I figured could fit from examples listed in my first post. since their skin is actually loose all over their bodies, and their pelts are so durable, it's much harder to inflict physical damage to them in a fight. that's where I got the +1 damage resistance, and the survival + is already explained. Don't ask me why i thought they'd be good at summoning beast spirits. (DERP) As for the disadvantages I figured the added lifestyle cost because of their rate of food consumption to keep their metabolism running like it does would possibly justify the extra survival advantage. If that's a bad idea though, I'll forgo it. I didn't know if there was a requirement rules wise about the amount of advantages/disadvantages you could take.