Godstiel
From Super-wiki
Godstiel is a fandom name for Castiel coined after 6.22 The Man Who Knew Too Much once he has absorbed the souls of Purgatory and proclaimed himself a god. 6.22 The Man Who Knew Too Much
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When Castiel has absorbed the souls of Purgatory, he proclaimed humself a god. 7.01 Meet The New Boss
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Godstiel use his powers for kill bad people. But, he dies when his body is overtaken by Leviathan.
see also Thingstiel and Clairestiel