There is the Six Heavens as the main worlds, while the Nine Worlds is the smaller version.
Lu Zan is born in the Ancient Era of Chaos in one of the Six Heavens. A genius who later became a Immortal, getting the nickname Blood Monarch. Gets sealed by his enemies but later on gets out of the seal.
He is in a completely different era: Gathering Yi Era.
(I know there are many Realms but I thought it'll be good to have many in this novel lol)
When you begin to cultivate, you have the first 7 Mortal realms:
Qi Gathering Realm: 7 stages
Refined Qi Realm: 7 stages
True Spirit Realm: 7 stages
Earth Spirit Realm: 7 stages
Saint Spirit Realm: 7 stages
Heavenly Spirit Realm: 7 stages
Divine Spirit Realm
After that you have the 4 Divine Realms:
Divine Body Realm
Divine Sky Realm
Divine King Realm
Divine Emperor Realm
After that you have the 5 Ancient Realms:
Ancient Lord Realm
Ancient Sovereign Realm
Ancient Monarch Realm
Ancient Emperor Realm
Ancient Overlord Realm:
After that you have the 4 Immortal Realms:
Immortal Origin Realm
Immortal Life Realm
Immortal King Realm: 7 stages -----------> here you're an Immortal.
Immortal Emperor Realm
After that you have the 3 Supreme Realms:
Supreme King Realm
Supreme Emperor Realm
Supreme Overlord Realm
After that you have the 4 Celestial Realms:
Celestial Origin Realm
Celestial King Realm
Celestial Body Realm
Celestial God Realm
After that you have the 4 Empyrean Realms:
Empyrean Origin Realm
Empyrean Monarch Realm
Empyrean Galaxy realm
After that you have the 4 Galaxy Realms:
Galaxy Origin Realm
Galaxy Observer Realm
Galaxy God realm
After that you have the 3 True Galaxy Realms:
True Galaxy Observer realm
True Galaxy Soul realm
True Galaxy Cosmic realm
(This was the peak of cultivation in the Ancient Era of Chaos. The cultivations after the 3 True Galaxy Realms are millions of years later when the cultivators became stronger)
After that you have the 3 God Domain Realms:
God Domain Constellation realm
God Domain Universe realm
God Domain Supreme realm
After that you have the 3 Soul Realms:
Soul Spirit realm
Soul Essence realm
Soul Exalted realm
After that you have the 3 Sublime Realms:
Sublime Imperial realm
Sublime Emperor realm
After that you have the 2 Exalted Realms:
Exalted Majesty realm
Exalted Universe realm
After that you have the 2 Ancestor Realms:
Ancestor God realm
Ancestor Emperor realm
As last you have the 2 Martial Realms:
Martial Dominator realm
Martial God realm
This isn't part of the story, just come back here if you're confused about the cultivation realms.