The mc is in a cultivation world ,( spoiler alert) the mc is in the lowest world for cultivation.

{{Cultivation realms}}

1.Qi manifestation realm

2.Body foundation realm

3.Qi core formation realm

4.Nascent qi realm

.... Other realms are for higher world's, the main power stems from techniques in this world that only a few selected have ,the technique are engraved in their dantian ,the techniques cannot be stolen as they are passed down from bloodlines or attained through luck

The mc has the technique called the "Empty Void " it's basic abilities are to use the runes the user currently has access to from the no.1 ability and change his physical body's bones and muscles to those crystalline microscopic runes . The abilities this technique grants access to are : 1) Boundless Formation: it grants the user access to mystical runes which form instaneously and undetected around 2 meters of the user, this runes then forms micro crystalline objects which are connected to each other and can form lethal attacks or defence,this runes are made of Qi and thus are tanjible but after crystallization they are solid. (Note the range increases as the mc's strength increases)

2) Ruination: This technique is performed when the user uses the refine qi in his dantian to form a large rune and then form another large rune from the qi of the Qi creation technique forming two or multiple larger runes and instead of connecting they rotate and collide since they are non compatible with each other due to one being refined and the other being unrefined and as they collide to form sparks known as 'empty sparks' these sparks which when collided with anything causes massive impact and destruction and disorientates the enemies qi.

3) Free dominion: It is a spherical non-existent domain that is created because the mc has a imaginary space that is only in his own imagination but because of the technique engraved in his dantian it reacted to his thoughts and thus the creation of such technique, it let's the mc create the lethal attacks from both the previous abilities but in the space of the domain which increases their lethality and range, because of the domain there is no trace of Qi as the domain drains the mind of the user which in turn means there is way to sense the incoming attacks .[ Note: This technique consumes an enormous amount of qi which a normal qi practitioner cannot sustain but since the mc also has an enormous amount of qi reserve probably the highest in the universe but the catch is that his reserves are only massive compared to people in his own realm, thus the mc can use it , but even then the technique is super draining]

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In this world of cultivation the techniques are the main road to power but that doesn't mean there is no hope for those who don't have these techniques as there are various ways to use Qi and strengthen themselves to the level of technique users in the early and mid stages , sword arts ,spear arts ,bow arts etc.. and also advancing their Qi stage or refining their bodies .

There is also the concept of powerful cultivators who can use the qi between the heaven and earth to heal themselves from fatal injuries such as losing a hand or even a head when their mastery over it is high,there are only a few of people even in the universe who can use it .Don't underestimate this ability as simple as a normal healing through pills or having body technique which heals you, as pills require, ingredients,an experienced alchemist and it also fills your body with toxins upon lots of consumption, using a body cultivation technique to heal your wounds require blood essence which is a huge price to pay .All these drawbacks don't apply to the "Qi creation" as it's only requirement is the concentration of the user to draw the natural unrefined Qi into the body .

[ The "Qi creation" technique is learnt when a person drawing the qi from heaven and earth learns to control the unrefined Qi which flows into the body and use the dao marks in the ' unrefined heaven and earth qi' to create the required parts since the qi is situated inside the body , and since the qi is still unrefined it still retains the small dao fragments of heaven and earth and the user uses those fragments to create the desired parts ,the whole process is done through the brain as the core but the soul can also be used as a catalyst when mastery over the technique is high .To perform this technique it requires absolute control over your own body , mind ,qi and a deep understanding of qi, hence, only a handful can perform this technique.The difference between those who can do this technique and those who cannot is so large that a person having learnt this technique can easily beat the other person who cannot use the technique like an ant vs human because the one who has mastered it already has better control and command over his/her qi]

Don't be mistaken and think that only having a technique means a person is strong as there are many factors that determine a person's strength such as your mastery over Qi manipulation,your output of Qi and lastly practice of the said technique, if we were to put two people in the same realm where one who has a technique and the other who does not , the victor cannot be determined as a weak user of a technique will surely lose to a person who has trained and honed his own arsenal despite not having a technique.