"Cut my throat, slash my body, cut my limbs… I can't die."
Dark Servant was a skill that consisted in creating a body made out of pure mana. Being a skill, so long as there was mana supplying the skill, the Dark Servant was technically invincible.
Unless the user ran out of mana, or the mana was directly cut off, there was simply no way to kill Ren.
…but that was the thing.
Ren's body was being sustained by his other self, a fact that weighed heavily on him.
Each time he died, he took the mana from the other him who was fighting against Jezebeth. He was invincible, but at the same time, his actions held a considerable weight on the outcome of the real fight that was taking place.
As Ren stood there, his body slowly regenerating, his thoughts raced.