Necrodeus

Necrodeus is the leader of the Skull Gang a group of interstellar ghostly skull shaped beings originating from Necro Nebula that works toward the total destruction of all light in the universe. Necrodeus mainly serves as the final boss of Kirby Mass Attack.

Kirby Mass Attack
Necrodeus is drawn toward Planet Popstar by its incredible light and wish to destroy it. Necrodeus is aware of Kirby's abilities and try to neutralize him by ambushing him and uses his magic staff to separate Kirby in 10 smaller Kirbies thus diminishing his strenght. Necodeus is then able to get rid of nine of the ten Kirbies but one manage to escape guided by the light of his own Heroic Heart that was separated from his body during the split.

Kirby manage to recrate nine other versions of himself and destroy the rest of the Skull Gang until he is face to face with Necrodeus. Kirby almost manage to get a hold of Necodeus' magical staff but the leader of the Skull Gang eat it to prevent Kirby from ever returning to his original form. The group of Kirbies face against Necrodeus and wins this time thanks to the Heroic Heart. Necrodeus is destroyed and the Kirbies can use the staff to become one again.

Trivia

 * Necrodeus's name translates to "God of the Dead."