Death god
From Tardis Wiki, the free Doctor Who reference
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Upon viewing Ashad manifest over Lake Geneva, Percy Shelley described what he saw as a "death god rising from Hades". (TV: The Haunting of Villa Diodati)
Much like other deities, death gods had their own alien dimension separate from the universe. (COMIC: Cindy, Cleo and the Magic Sketchbook, Old Girl)