Note:
You don't have to read the description of each realm in order to continue on with the story, but it does give a good general idea about what each cultivation realm can do.
Each and every realm listed on here are divided up into 9 different levels. (Ex: 1st level of the Body Tempering Realm, 2nd level of the Body Tempering Realm, etc).
As the story continues to progresses even further, more and more realms will eventually be added onto the story.
1) Body Tempering Realm -
The very first Stage of Cultivation, through special techniques one can train the physical body and increase strength. Cultivators can lift hundreds of pounds, break through the limits of humanity, run faster than horses and can now sense the Qi filling the World. Only those who successfully condense Qi into their Dantian and can begin the long path in Cultivation.
2) Qi Condensing Realm -
Cultivators at this point now have enough Qi in their Dantian to start using it in low-level techniques they have learned, and in the eyes of Mortals they look like gods.
3) Qi Transformation Realm -
Cultivators can now begin refining their Qi, allowing Cultivators to now use it outside of their bodies with enough training, practice, and knowledge. They are also capable of making talismans and magic artifacts as long as they have enough knowledge to do so. At this point Cultivators can't be seen as human anymore, and they can live up to 200 years old.
4) Innate Realm -
Qi can be used to protect and strengthen one's soul, and some cultivators in this stage can also attack one's spirit. One's control and power over their Qi is much better now, with their life span being at 500 years old. At this realm, a great tribulation will also descend once the Cultivator reaches the bottleneck, many have fallen here but cultivators will be able to gain great power if they pass.
5) Golden Core -
To reach this realm one must refine their Qi into a much more powerful True Qi and pass the great tribulation, allowing them to make a Golden Core (JieDan). At this Realm, Cultivators can perform much more daunting and complex tasks due to True Qi such as flying or materializing weapons that one has mastered.
6) Nascent Soul -
The gap between this and Golden Core is like Heaven and Earth. Qi and soul can now become one, allowing them to do things never thought of before. At this realm, cultivators can travel freely out of their bodies and through their souls. This is also the peak known to Modern Day Cultivators, however, there are tales of realms much stronger but it is not known if anyone has surpassed it in the modern cultivation world.
7) Transcendent Realm -
With a sufficient comprehension of the Dao one can reach this realm. One's lifespan goes way beyond past the mortal limits, and can live for thousands of years. Cultivators reaching this realm are granted with a Heavenly Blessing allowing those at this realm to have more unique and stronger powers than those in the Nascent Soul Realm.
8) Void Fusion Realm -
Only the best of the best have a chance to reach this realm, even then the chances are extremely low. Those who can cultivate to this realm have great powers capable of changing the World for either good or bad. The body of cultivators at this realm are strong enough to survive a nuclear blast. At this realm, a another Heavenly Tribulation will descend once the Cultivator reaches the bottleneck. This is a long forgotten realm due to there being almost no Void Fusion cultivators in the history of the World.
9) Void Refinement Realm -
A being that has reached the top of Humanity, not quite Mortal but not yet Immortal. At this realm, a cultivator's soul evolves, allowing it to escape and possibly be reborn after death. No records of Cultivators reaching this mysterious realm. Cultivators can now begin refining their True Qi into Heavenly Qi.