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Ainz Ooal Gown
Ainz Ooal Gown (アインズ・ウール・ゴウン), formerly known as Momonga (モモンガ), is the main protagonist of Overlord. He is the guildmaster of Ainz Ooal Gown and regarded as the highest of the Almighty 41 Supreme Beings by the NPCs of the Great Tomb of Nazarick. As the Sorcerer King of the Sorcerous Kingdom...
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So, he used an Instant Death spell called [True Death] that negs ressurection, as stated by Ainz itself
Source: Volume 9 from the Light Novel