Demolt (デモルト, Demoruto) and Roberto Vile (ローベルト・ヴァイル, Rōberuto Vairu) are the final Ancient Mamodo/human team that Zatch, Kiyo and their friends face. Demolt is the last and most powerful of the Four Supreme Mamodo from a thousand years ago, and was nicknamed the "Crazed Warrior Berserker" because of his massive size and power. His spell powers revolve around the claws on his hands, one of his spells allows him to use them as a handheld weapon. However, Demolt is not very intelligent; his power as a servant of Zofis comes from his bookkeeper, Roberto Vile, whose mind is not controlled and who plans to use the Stone of Moonlight to control the minds of humans after Zofis becomes king. Demolt, after having his true self awakened, becomes annoyed with his bookkeeper and swallows him becoming