0th Realm: Mortality/Qi sensing
99% of the population spend their entire lives in this realm. Mortals who desire to change their fate and enter the world of Cultivation must first learn to sense and therefore manipulate Qi. Mortals learn to sense Qi through meditation. Some waste their entire lives meditating yet fail to complete this first step. (Average Lifespan: 30 years. Living in a medieval setting doesn't do wonders for one's lifespan)
1st Realm: Meridian Opening
In this stage, cultivators unseal their 12 meridians. Cultivators in this Realm are unable to store energy so they open their meridians by channeling energy through their bodies through various meditation techniques. In this Realm, cultivators cannot project qi outside of their bodies, though certain techniques can allow them to channel qi through weapons or tools. This Realm is divided into 12 different Stages, each Stage corresponding to the opening of a different meridian. (Average lifespan: 80 years)
2nd Realm: Qi Gathering
To enter this realm a cultivator must unseal their Dantian. during this Realm, cultivators focus on filling their Dantian. The cultivator can also optionally attempt to unseal his 8 extraordinary meridians. Each extraordinary Meridian unsealed will permanently enhance the cultivator's qi storage capacity. The Qi Gathering Realm as well as every Realm after it is split into the Initial Stage, Early Stage, Mid Stage, Late Stage, and Peak Stage. Most of this stage is technically optional as a cultivator can enter the Qi Refinement Realm as soon as he reaches Early Stage Qi Gathering but a Cultivator needs to have reached the Peak of this Realm to even have a chance at opening the 8th extraordinary Meridian. (Average lifespan: 120 years)
3rd Realm: Qi Refining
In this realm, a Cultivator starts refining their qi to increase its purity and therefore its power. In this Realm, the elemental affinity/affinities of the cultivator start to come into play. Most cultivators end up having to search for a new Cultivation Technique that matches their affinity in order to progress to this Realm. In this Realm, cultivators gain the ability to conjure and manipulate their affinities (fireballs from Fire affinity cultivators, temporary flight from Air/Wind affinity Cultivators, etc.) (Average lifespan: 150 years)
4th Realm: Spiritual Sea
In this Realm, a cultivator condenses their refined Qi into a liquid, forming what is known as the Spiritual Sea. In this stage the Qi capacity and therefore the combat strength of a Cultivator skyrockets. To reach the Peak Stage of this Realm a cultivator must entirely fill their dantian with liquid Qi, only then may a cultivator create their first Foundational Pillar and enter the Foundation Realm (Average lifespan: 250 years)
5th Realm: Foundation
In this Realm, a cultivator uses their cultivation Technique to form pillars of solid Qi out of their Spiritual Sea. The number and form of these Foundational Pillars depends on the Cultivation Manual/Technique the cultivator uses. Any semi-decent Cultivation Technique will form Pillars that grant the cultivator different benefits depending on the technique used (increased Qi absorption/generation, increased speed, the ability to use a powerful Technique or set of Techniques, etc.) The fixed and solid nature of the Foundational Pillars means that it becomes extremely difficult and potentially even dangerous for a cultivator to change their Cultivation Method once they reach the Foundation Realm, this difficulty means that cultivators usually don't see changing their Method as being worth it. Furthermore the difficulty and danger of this process increases with every Realm after the Foundation Realm. (Average lifespan: 400 years)
6th Realm: Qi Core
in this Realm a cultivator merges their Spiritual Sea and their Foundational Pillars, condensing them into a solid Qi Core. This Qi Core has the capability to store massive amounts of Qi. The higher the condensation of the Core at its creation the more Qi it can store. Additionally, Qi Cores have the ability to use Qi to create more Qi. This allows a Qi Core Cultivator to regenerate their Qi stores even when in an environment completely devoid of Qi so long as the cultivator hasn't completely emptied out their Qi reserves. The shape and color of a cultivator's Qi Core depends on the cultivator's Affinities and Cultivation Technique. Qi Cores are almost always spherical but some of the more complex, powerful, or unique Cultivation Techniques form differently shaped Cores (such as sword-shaped Cores, Mobius Strip Cores, multiple cores, and so on.)
As a cultivator progresses through this realm they gradually increase the size of their Qi Core. Upon reaching this Realm's Peak Stage, a cultivator fuses their Qi Core with their Dantian. (Average lifespan: 1000 years)
7th Realm: Dao Formation
In this Realm, a Cultivator creates what is known as a Path or Dao. A Dao is essentially the sum of a Cultivator's understanding, personality ideals, morals, sense of self, life experiences, Cultivation Method, Affinities, and Techniques. A Dao grants a Cultivator massively increased comprehension ability of Techniques and Cultivation Methods that align with their Dao as well as a small boost to the comprehension of techniques that do not conflict with their Dao. On the other hand, it becomes a lot harder for a cultivator to learn Techniques that go against their Dao, for example, a Holy/Righteous cultivator would find it almost impossible to learn Evil Techniques once they have formed their Dao. Additionally a cultivator's Dao automatically imprints itself upon their Qi over time, this process has both benefits and drawbacks. The main benefit of this Dao-infused Qi (commonly known as Spiritual Qi) is that it is a lot more efficient and powerful than normal Qi. The downside of having spiritual Qi is that Techniques that conflict with a cultivator's Dao become a lot weaker, for example a cultivator that follows a Dao of All-Consuming Flames will have more trouble using his flames in a creative fashion than a destructive one, while a cultivator that follows a Dao of Healing Waters will have the exact opposite problem. As a Dao is formed from ones life experiences and personality each cultivator's Dao is unique and personal to them. Even if two cultivators have the same Affinities and practice the exact same Techniques their Dao's will differ slightly. From this stage onwards a cultivator can harm (or in extreme cases potentially even cripple) their cultivation by acting in a way that violates their beliefs or morals (and therefore violating their Dao.) While it is possible for a cultivator to completely change their Dao once it has been formed, but like changing ones Foundation it is extremely difficult and potentially lethal and the difficulty of doing so scales with a cultivators Realm. (Average lifespan: 5000 years)
8th Realm: Nascent Soul
To enter this Realm, a cultivator uses their Dao to condense what is known as a Nascent Soul within their Qi Core. A Nascent Soul is a spiritual construct derived from a cultivator's soul that enhances a cultivator's control of their Qi. A nascent soul greatly enhances a cultivator's conscious and subconscious control over their Qi to the point where a Nascent Soul Cultivator's Qi can be said to be a physical extension of their will, this results in cultivators in this stage or higher needing little to no conscious thought to exhibit low-level techniques. (This ability has led to amazing feats such as a cultivator defeating an assassin before they even noticed they were trying to harm him, or a cultivator destroying an entire Evil Sect while sleepwalking.) As a cultivator's Qi becomes linked to their subconscious, users of certain Cultivation Manuals can have their power enhanced or weakened by certain strong emotions, this fact has resulted in a belief among low Realm Cultivators that the fastest way to die is to make a Nascent Soul Cultivator angry, (though some reason that this advice can be applied to pissing off any cultivator with a higher Realm than oneself.) Another powerful ability of a Nascent Soul is that it grants its owner the ability to survive after death. Upon the destruction of a cultivator's physical form, a cultivator's consciousness transfers to their Nascent Soul, temporarily becoming a ghostlike being. A cultivator is extremely vulnerable in this state being able to be killed with a single well-placed attack capable of harming a non-physical entity. A cultivator in this state must eventually return to a physical vessel or risk death. This vessel can be anything from a lab-grown clone, to a construct or even an unsuspecting cultivator of a lower Realm. A Nascent Soul usually looks like a miniature version of its creator, though Soul Cultivation Manuals can alter the appearance of a Nascent Soul and even give it new abilities. While a cultivator having multiple Nascent Souls is not unheard of, it is extremely rare.
(Average lifespan: 20000 years)
9th Realm: Spirit Form
To enter this Realm a cultivator must use their Nascent Soul to create what is known as a Spirit Form. A Spirit Form is essentially an ethereal backup for a cultivator's physical form. A Spirit Form vastly improves a cultivator's ability to survive the destruction of their physical form. Unlike a Nascent Soul by transferring their consciousness into their Spirit Form a cultivator can retain basically all of their combat power with the added bonus of being immune to purely physical attacks. Another advantage a Spirit Form has over a Nascent Soul is that a cultivator can not only use it to survive without a physical form indefinitely, but they can use it to regenerate their physical form from nothing. (average lifespan: (100000 years, having a literal backup save for one's physical form does wonders for one's lifespan.)
10th Realm: Domain of Power
To enter this Realm a Cultivator must enhance their near-perfect control of Qi to the point where they can project a field around themselves that grants them absolute control over the ambient qi in the environment. This field is known as a Domain of Power and it effectively turns any terrain within its range into a perfect killzone meaning that getting within the range of an enemy cultivator's domain is suicide for any cultivator of a lower Realm (though fighting a cultivator with a higher Realm than themselves would be suicide anyway). Your average Domain has two different states or modes firstly there is a passive mode that grants the Domains owner the agility to see everything within their Domain. A Domain grants its owner the ability to control the ambient Qi in their surroundings allowing a cultivator to launch attacks from anywhere within their Domain , an extension of this ability is being able to stop, deflect or even reflect the attacks of cultivators with a lower Realm that the Domain owner. Finally the Domain allows a cultivator to rapidly replenish their Qi reserves by absorbing ambient Qi. A Domain in a activated state has all the abilities of its passive mode but in addition the Domain will shift the attributes the ambient Qi within it into attributes that match the Domain (and therefore the domains owner). This process not only amplifies the Domain Realm cultivator's Qi regeneration even more, but it gradually transforms the surrounding environment to match the Domain Realm cultivator, (for example, a fire affinity cultivator's Domain might end up creating a lava flow or a raging inferno, a nature or plant affinity cultivator might create a forest of trees or a field of trees and so on and so forth.) Most Domains range in size from 100 meters to 500 meters though legends tell of cultivators with domains hundreds of kilometers wide which when activated permanently alter the geography of a location. Cultivation Techniques and certain Cultivation Manuals can give Domains additional abilities. If a cultivator somehow gains access to multiple domains they should only be able to use one at a time, (though only the xianxia gods know what busted new abilities the MC shall receive after reaching this realm.) (Average lifespan: 500000 years, meditating Domain realm cultivators are occasionally dug up by archeologists while searching for fossils.)
11th Realm: Unbound Existence/Immortality
This is one of the hardest Realms to enter as reaching the Peak Stage of the Domain of Power Realm is just the beginning for those who desire true immortality. To become an Immortal one must use their power to server entropies hold over their existence effectively becoming biologically immortal and unkillable by normal means. To successfully pull off this literally impossible feat one must become so powerful that they can literally ignore the laws of reality. This means that any Immortal is able to at will ignore some if not all of the laws of physics, logic and common sense. This allows Immortals to pull absurd feats such as, literally severing fate, breaking ones resolve (in the most literal sense possible), identity theft (where the previous owner of the identity becomes a faceless nameless ghost unable to interact with reality), picking themselves up (Lorax style), moving while time is stopped and the list goes on. Being unbound from entropy means that in order for someone to kill or even harm an Immortal they need to use an Artifact or Technique that applies an artificial law of entropy on an entity, Artifacts that can do this are known as Eternity Slayers. (lifespan: literally cannot die, though words like cannot or impossible don't really mean much at this level of power.)
12th Realm: Divine Core/ Godhood
While the Unbound Existence Realm is literally impossible to reach without violating the laws of reality itself it is still easier to reach than the Divine Core Realm. Only 1% of the entire population of Immortals ever reach this level of power despite having a theoretically unlimited amount of time to work towards it. The most notable ability that comes with Godhood is the ability to be empowered by the faith of others. The more believers a God has the more powerful they become. Though wholehearted devotion grants a Deity the most power just mentally acknowledging that a certain God is an unstoppable cosmic force grants them a small amount of power. Additionally if a God is somehow destroyed soul and all, so long as said god still has enough believers their soul will eventually regenerate from nothing. As most Gods have believers all across their home multiverse this makes permanently killing a Deity so impossibly difficult that even other Gods usually dont waste their unlimited amounts of time trying. (lifespan: will probably outlive their home universe.)