Start with Mc training in his hometown/forest until magi academy
Go to the capital and meet sophia who will be a love interest but not actual Female Lead we will meet her later
Show off cooking skills (this will be relevant later) probably magi cooking that boosts training speed and a money maker throughout the story
Unlock the first soul fragment from the void and the null magic is on cooldown.
Start the entrance exams chapter . Lets make it so the chapter starts with the magical aptitude where he shows all 7 elements (Lightning, light, dark, earth, wind, fire, water) and his null magic which will be branded as (Unknown)
So he will walk up to a crystal ball and it will test his aptitude, make the proctor have a gleam in his eyes and let him wait in anticipation, next do the spiritual power or what rank they are which can give a little estimate of their talent and work ethic. Make him as good as a 5 year student with Superior talent who worked tirelessly
Magical talent test (how easily they absorb mana and recover it) make him break the ball and ask if he has to pay for it ;)
I want all of this to be a secret as they go into private rooms, he will be a prize student but they will help him keep his head down. We will make him show 'Genius' talent instead of super genius so all 7 plus null and high level talent.
Now we go into the academy, he will be taking the 7 elemental classes and will have a tight schedule. We want to introduce the female lead here with her also being a 'super genius' who has her curiosity piqued due to things he can do that she views impossible.
He will be learning spells at uber speeds and has his own personal spells that use primordial energy due to the void fragment. The soul magic of his null spell will have a 1 year cooldown to start as his soul can't take the tiring process as of now. as he gets stronger and strengthens himself the cooldown will get progressively stronger until when he reaches tier 100 scholar path he will fully unlock the void soul. Then as he masters his void powers he will unlock his chaos soul. and lastly when he masters chaos he will gain complete mastery instantly over his past soul knull and gain understanding of all 'laws' making him go above primordial and entering into ascendance of knull.
But that won't be till later on.
Throughout academy years 1 and 2 we want the MC and FL(female lead) to get progressively closer, whether its studying subjects or just reading together they will develop small rivalry and a wholesome friendship. Then in year 3 the FL will hear news that her home kingdom was attacked and her family (royals) were killed. This will effectively clear up the MC and FL to not be bothered by any connections to their families and basically only have each other.
The FL will rush out with tears in her eyes at this point and be ambushed by her families aggressors where the MC will catch up to see them impaling her with their swords killing her. He will then go berserk ripping them to shreds and decimating the nearby area killing hundreds of thousands of monsters and creating an abyss in the forest he used to train in.
This will be when the cooldown to his null magic finally is finished for the 5th time, giving him the complete void soul. He will then use the complete powers of the void for a small amount of time to bring back her from the dead as her soul hasn't yet left the land of the living because she feared even in death that he would be hurt by her killers. They will have a heartwarming reunion where they will confess their love for each other starting their relationship. After he says his words "I love you Emma" he will pass out from energy exhaustion and be put into a week long coma, while Emma is sobbing his name thinking the worst and crying out that she loves him too, later in a hospital where he wakes up to see her looking thin and pale by his bedside. He later learns that she hasn't eaten anything in 2 days because he woke up later than he should have and had never left his side for anything than going to the bathroom. He will then hug her reassuring her that he is okay and they will share their first kiss as the sun sets. (He was at a hospital but I will make them go to the roof for this scene)
Im half and half whether they should go back to school because he already has all the magical knowledge in the world so I think they will settle down for a while maybe 10 years until they become 25 the legal age to become part of the army. In the time that they will settle down they will reaffirm their feeling for one another and get married and 21 after dating for 6 years as well as living together. Knull will teach Emma(FL) all of his knowledge on void and elemental magic as well as train together until Emma reaches tier 100 scholar and he masters his void magic unlocking the first chaos soul at a later date. They will enlist as generals due to their massive strength at such a young age and knull's incredible mind for military tactics. This will start the 3 race war arc where the barrier that surrounded humanity for centuries is destroyed after being weakened in the attack on Emma's family which we will now learn are the guardians of the barrier something she herself didn't know until an uncle meets her on the battlefield. This is where we start to see Knull's personality split into 4 1 for each soul.
Emma and him will explore his now immense magical power as well as try to make him realize that all 4 personalities are still the same him, just with more emotions being amplified. For example the greater his killing intent is the more powerful he is when he turns berserk this is from the chaos. When he is meditating if he has total serenity he will get a 10x boost in his magical gathering and recovery (this is from the void), and when his personality splits his minds will now have the ability to think 4 things at once as well as have all of his magical power boost his physique to Demon king levels making him a massive powerhouse in the world (this is from knull). Lastly his love for humanity will be amplified making him more empathetic to people around him (this is from human knull). The 4 personalities will only show differently in times of crisis where the 3 primordials and the human decide what to do in the situation making use of the literal uncountable amount of years of experience the souls have.
After the war is finished with Knull and Emma setting a trap for the beastkin and demonkind they create a treaty that Knull sees over, the treaty much to the surprise of the demons and beastkin is favorable to all as it makes the 3 kingdoms create a massive formation to ward out monsters from outside the continent as well as sea creatures for the most part while also establishing a new capital where the 3 paths are taught with no prejudice against race. Emma and Knull will settle here while he tries to master his chaos abilities. We will also start having Emma awakening a 9 tailed fox bloodline which makes her much more powerful as well as a phoenix bloodline a gift from knull making her immortal along with him. This will lead into the arc where they ascend into the godly planes and start their journey to ascension to primordials. Emma and Knull will create a new form of magic that centers around his soul magic that can bind two people together (in this case emma and knull) and share each others comprehension, and magical power, as well as create a mental and emotional link. To top it off it allows the 2 people to teleport to one another at will. They will name this new kind of magic bonding magic. With emma and knull now bonded they will also gain insights into the others main laws. Knull becomes proficient in the laws of fire, life, and yin. And Emma become proficient in the laws of Knull (emptiness), Chaos (basically a more powerful version of the 7 elements if you combine them but less effective than the actual laws in a 1 - 1 for example a person with comprehension over fire law will have more powerful fire than the chaos fire), As well as void which allows them to create anything from nothing at the cost of much more energy cost or one matter to another at low cost.
With these new insights they start to try to gain their divinity while having small fights with gods looking to antagonize them as well as creating their own parthenon. They will become Knull the god of the void, the chaos, and knull and Emma the goddess of life, yin, and fire. They will make a name for themselves and their parthenon will start to expand until it becomes the most dominant parthenon in the heavenly realms. This is where a large uprising of gods who fear their explosive growth happens. Half the divine realm will band together under a god who used to be the leader, when their parthenon learns what is happening they choose to surrender leaving Emma and Knull alone and betrayed to fight half the heavenly realm. Here there will be a massive war that will go on for 100 years ending with Emma sacrificing her life to kill the rest. Now his 4 souls who have bonded with emma will go absolutely berserk unleashing tides of energy across the entire heavenly realm smashing everything to dust and killing everyone. When knull wakes up from his trance still grieving the loss of his beloved he collects her soul and keeps it sealed within his soul space. He, now being a primordial above the void, the chaos, and knull combined unleashes one final burst of power ending all life within the universe that hurt his dear Emma so much. He will watch as all the worlds start to crumble with all life ending. He will watch people die out and watch the universe end.
FINAL CHAPTER/S
Knull still grieving the loss of Emma decides to listen to her advice of "Please live on" and creates a new universe from scratch. This time he doesn't give anyone any special abilities or any fancy magic. Instead he gifts mankind with the gift of intelligence and lets them develop. Only interfering when they veer down the wrong path. After becoming satisfied with his work he releases Emma's soul back into the reincarnation cycle for her to be reborn again.
Millions of years will pass until finally He catches a glimpse of a young woman running through the streets with tattered clothes and stolen bread in her hand. She will be reborn as an orphan due to her soul being too strong for a weak mother to carry and a father who died in an accident. Knull decides to go meet her again so he appears in front of her taking her with him and loving her again. This will be the end of the story as Emma and Knull become the strongest beings that ever have and ever will exist and having each others company for the rest of eternity.