Hey, im trying out unleashed fury right now and i noticed that you loose every stack after 3 seconds if you are not in combat this makes the passive not usable at all in my opinion u should maybe extend it to 5 seconds or make it so the stacks decay overtime and not just loose all the stacks completely.
Most of the time after a pack u get like 10 stacks maybe and loose them instantly while walking to the other pack.

Thats just my opinion tell me what you think guys if you tried this passive out!