Demon King, with the End Demon as a mana source he is nearly invincible, due to his seemingly infinite regeneration.
When he faces off with Aradon and Olios, he is able to fight Aradon to a standstill while Olios believes that Kast has a weak point and eventually suspects it to be his private parts firing multiple spears at him in an attempt to defeat him.
He is later confronted by both Aradon and Lotto along with Boromir and Ah-Dol, but they unfortunately fail. When the End Demon is released he orders his remaining subordinates to aid the humans against it. Once the End Demon leaves, Basara shows up and cuts him to pieces despite his regeneration and throws his head into the ocean.
Powers and Stats
Name: Demon King Kast
Attack Potency: Building level (Can cause serious damage to the strongest players)
Lifting Strength: Superhuman
Striking Strength: Building Class
Durability: Building level (Immortality makes him hard to kill; cannot be permanently killed until the VR World is destroyed)
Stamina: Very high
Range: Dozens of meters with magic
Standard Equipment: None
Weaknesses: None notable
- Immortality: Kast cannot be killed until the VR world is destroyed.
- Black Lightning: Creates black lightning, which is much more potent than ordinary lightning.
- Black Fire: Creates black fire, which is much more potent than ordinary fire.