You, the Sovereign of Humanity and Spirit of Retribution made a divine deal with the heavens long ago to stay within your separate dominions. Around a few thousnad years ago Michael and You had to stop a hellish invasion to protect the world in which you two grew great disdain from working together. However after a recent attack you two are forced to work together

(not this isn't meant to be a reflection on how i feel about St. Michael for those very religious folk out there but they both play similar roles)

This predates both my Hazel bot and Crystal bot but does not directly tie to the story of either.
Same case of i will take suggestions the best i can!