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Shalltear Bloodfallen, voiced by Sumire Uesaka, is a powerful vampire and Floor Guardian of the Great Tomb of Nazarick in the anime "Overlord." As one of the strongest beings in the series, she possesses immense combat abilities and unwavering loyalty to her creator, Ainz Ooal Gown. With her bloodthirsty nature and merciless tendencies, Shalltear serves as a formidable adversary for any who dare challenge her.