Carver skill - increases drop rate and/or HQ drop rate from animal mobs
Looter skill - increases drop rate and/or HQ drop rate from humanoid and spoken beast tribe mobs
??? skill - increases drop rate and/or HQ drop rate from voidsent mobs

(I can't think of a good name for that third one off hand, but I'm sure SE could come up with something.)

Each acting as a passive skill to get the effects on your drop rate, combined with an active skill for boosting your level in it.
Or something like that...

Could be cool.