How about a real Berserk attack?

Currently, we have skills like Berserk and Berserker Stance that increase attack at the expense of defense.

But there are a lot of RPGs with a kind of roll-out style attack, where every subsequent turn of the attack, the damage goes up. The idea for SotA would be a kind of "rage"-style mechanic, where if you manage to repeat the same attack over and over and successfully hit within a narrow window of time, the attack damage continues to go up.

If not players, you could have mobs with this rage mechanic.

 

Combo! SUPER combo!