Goblin Shaman
 

Too bad they are so fragile. Their "lower" resistance passive ability is rather nice, and having them around lets you top off your goblin army without needing to go back home.

That said, the lower resistance effect is cumulative and can become negative.

For long battles where you got a tank slowing the heavily armored enemy down, this is great.

At adrenaline level 3, 4 hits with a goblin shaman will reduce his physical resistance by 20%.

That's like giving EVERYONE in your party a +20% dmg item.

Throw that in with the Goblin's zeroing in, you will converge to the 60 attack/defense difference or 3X damage bonus, and you can definitely see how these puppies do a lot of damage.

And the nifty part is, goblins and goblin shamans use axes. :) There is a +30% critical hit with axes item.

Technically, this is against a foe with 0 resist, against paladin for example, these 4 hits will increase your damage against him from 70% of its calculated value to 90%, which mathematically calculated is ~30% increase, and against something with 80% resistance, lowering it with 20% will give you basically double damage against it :-P