Acid fire.
This is a special fire that O'a wields and possess a special characteristic.
This characteristic is an armor melting.
Each time the enemy is hit with the acid fire, their defense drops.
The effect normally drops by small amount, but the effect can stack over and over, AND each of the O'a enchanted fire attacks has this characteristic and some of the stronger attacks melt even more of the enemy defense.
So, even though the undead death knight paladin has an extremely high defense to the point where O'a and Hera attacks were barely doing a damage.
Not only that, the undead paladin healing effect made it so that its health was almost all time full even when they did managed to land a solid hit against him.
However now?
O'a acid fire was hitting the paladin over and over, making the melting effect stack many times over and over.
