Necrodeus appeared in 2011 video game called Kirby Mass Attack. Necrodeus is the main antagonist of Kirby Mass Attack. He also serves as the Final Boss in the game.
He is a "head and hands" boss, similar to Wham Bam Rock and Wham Bam Jewel from Kirby Super Star and its remake, and Master Hand and Crazy Hand from Kirby & The Amazing Mirror.
Necrodeus' head is a horned white skull with lustrous red eyes. He seemingly has a third eye socket in the middle of his forehead, but no eye is seen within. Necrodeus has two curved horns on the sides of his head and a smaller, straight third horn on its top. Inside his mouth lies a set of sharp fangs, and he has an uncharacteristically wacky-looking clown nose. His body is made of purplish black smoke, which during the beginning cutscene almost resembles Nightmare's cloak. Around his neck is a necklace made completely out of Skully-like skulls. Matching the rest of his cadaverous features, his hands are skeletal and can come together to create a red eye-like marking on his wrists.
He initially wields a black staff with a purple jewel in its top which he uses to decimate Kirby at the beginning of the game, but swallows it in preparation for the final confrontation, requiring Kirby to destroy him in order to retrieve it. As the final battle concludes, his true form is revealed to be a purple Zero-like eye (especially similar to its small red core) that lies within the jaws of his skull.