Fatal revenge

Attack on the enemy. Ignores Invulnerability and Shield. Fills its turn scale by 30%. If the target has 50% or less health left after the attack, it fills its turn scale by 60% instead. If the enemy is killed, it reduces the cooldown of the skill Breaking Steel and Fatal Revenge by 1 turn.
Damage depends on [ATK] = 5.5 × [ATK]