This is not really a spoiler since I'm just listing the planes and not explaining them but skipping this chapter will not affect the story in any way
Firmament
Astral Plane
Seven Heavens
Nine Hells
Abyss
Elysium
Nether Blood Realm
Godbeast Realm
Evernight Realm/Realm of Enternal Night
Primordial Realm
Ominous Land