What follows below are the cultivation realms and what the MC knows about them, this section will be updated as the MC learns more.
Each realm is also split into the early, middle, and late-stage, but this is rarely used in the earliest stage of cultivation as the increase in strength between each door of the Mortal Heart is usually negligible. For realms focused on nine steps, each group of three will be a sub-realm. For example, the three first Mortal Doors are the early-stage, the next three are the middle-stage, and the final three are the late-stage.
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9 Doors of the Mortal Heart, more commonly referred to as the 9 Mortal Doors. It is the earliest cultivation realm and focuses mostly on learning how to draw in the surrounding Qi and getting your body accustomed to it. Once you've gotten your body so accustomed to the Qi that it started to create a bit of its own, you could start moving onto the next cultivation realm.
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9 doors of the Immortal Heart, commonly referred to as the 9 Immortal Doors. In this realm, you take all the Qi that your body has started creating and move it into your dantian, gathering it and merging it until it forms a door and you officially enter the 1st Immortal Door. This door will then start producing Qi for you and the end-goal of this realm is to create nine such doors.
9 Earthen Doors. Once you've formed nine Immortal Doors and merged them all into one and successfully opened the door, you will step into the realm of the 1st Earthen Door. From this point on you will focus on expanding and shaping the inside of your Earthen Door, forming a space where you could gather the vast amounts of Qi created by the door. When the space reaches a saturation point you will need to use all the Qi within it to create another door within your 1st Earthen Door, formally entering the 2nd Earthen Door.
9 Skyborne Doors. The realm following the Earthen Doors, but the Mc knows next to nothing about the realm.
World Heart. The realm following the Skyborne Doors, but once again, the Mc knows next to nothing about it.
Sovereign God. The Mc only knows that it's supposed to be the peak of all cultivation realms, leaving you fit to rule your own dominion but nothing else.