In Endless World, the Cultivation Realms are incredibly simple and are more or less just empty titles. But the cultivation realms used by the protagonist start out simple but grow complex. Unlike other worlds, the cultivation system from Primordial World (The protagonist's homeworld) goes through a thorough aspect of the body and soul.
Major Cultivation Realms (Primordial World)
Foundation Building Realm: A false cultivation realm where a practitioner trains their body using Vital Energy
Qi Gathering Realm: A false cultivation realm where a practitioner begins gathering False Qi and refining it before placing it within their Dantian.
Blood Warrior Realm: The first cultivation realm where a practitioner begins condensing Qi within their body and fusing it with Life Energy.
Mental Incarnation realm: The second cultivation realm where a practitioner begins understanding their path.
Spiritual Manifestation Realm: The third cultivation realm where a practitioner gathers Soul Essence and their Martial Soul undergoes a transformation.
Core Crystallization Realm: The fourth cultivation realm where a practitioner crystalizes all previous forms of energy into True Qi.
Domain Realization Realm: The fifth cultivation realm where a practitioner begins understanding the concepts of a Domain.
Domain Actualization Realm: The sixth cultivation realm where a practitioner creates a domain.
Dao Core Solidification Realm: The seventh realm where a practitioner undergoes a transformation restarting the martial path and undergoing enlightenment thus creating a Dao Core.
Heavenly Core Crystallization Realm: The eighth cultivation realm where a practitioner condenses their True Qi and Dao Core into a heavenly core, the base for Deity Realm.
Law Realization Realm: The ninth cultivation realm where a practitioner begins understanding their Law.
Law Creation Realm: The tenth cultivation realm where a practitioner creates their Law.
False Deity Realm: The eleventh cultivation realm where a begins understanding the concept of World and Diety.
Unknown: no cultivator within Primordial World has passed False Deity Realm.