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
When Castiel has absorbed the souls of Purgatory, he proclaimed humself a god.
7.11 Meet The New Boss
Godstiel use his powers for kill bad people. But, he dies when his body is overtaken by Leviathan.
see also Thingstiel and Clairestiel