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.
7.01 Meet The New Boss
Godstiel use his powers to kill many angels who had sided with Rapahel. He also kills people he deems are going against his will including clergy and motivational speakers. He performs healing miracles. As the leviathans start to take over within him, and his killing becomes indiscriminate, Castiel returns to Sam and dean, and they help him return the souls to Purgatory.
see also Thingstiel and Clairestiel