The final battle between Angels and Demons already has a release date, announced in the Hazbin Hotel Season one Trailer.
HAZBIN HOTEL Is CRAZY! Episodes 0-2 REACTION!
Review – Helluva Boss (Season 1) - Geeks Under Grace
Hazbin Hotel First Look Images Preview Animed Comedy From Prime Video
Review – Helluva Boss (Season 1) - Geeks Under Grace
Review – Helluva Boss (Season 1) - Geeks Under Grace
Hazbin Hotel' Trailer: Welcome To Hell Wayward Sinners
Some thoughts about Charlie's flawed view of redemption : r/HazbinHotel
Journals and Fanfics on FNAF-Addiction - DeviantArt
Demon - News - IMDb
Review – Helluva Boss (Season 1) - Geeks Under Grace
Hazbin Hotel' Season 1 Official Trailer Releases With Original Song