Remembrance
Nothing is louder than overthinking after midnight
A god's or deity's awareness is it's ultimate killer and destroyer. Knowing that everything around it dies and that it can feel pain and loneliness would be a good reason for a deity or god betraying it's pantheon. Them believing existence is painful and wanting to have no part of it, as well as wanting to destroy the concept of existence itself is a good setup for a neat little story.I'm not sure how that would've helped...?