....Is so damn broken! Basically the skill reduces armor rating with 4% and can stack up to 5 times + doing dmg. But here's the thing, it stacks 5 times for EACH merc using it which means you can reduce a mobs armor rating by 80% in matter of seconds in which you can just finish them off with a rail shot. I tried this in a group of mercs against tougher mobs and it was sick. It even works really good solo in pvp, all you have to do is spam it and maybe use a stun/pushback and finish them off with rail shot or normal attacks. You don't even have to use any of your other abilities. Nerf hammer inc when people finds out about it!