A GREAT BATTLE

Rukito's sword meets Silvaren's with equal power, and after both recoil, they attempt to anticipate each other's following action. Suddenly, Rukito is struck from behind by a root, propelling him forward, while additional roots aim for him as Silvaren chases after.
Rukito teleports behind him, delivers a kick, then rushes in front of his path, knocking him   down and preventing the roots from striking. Without wasting a moment, Rukito descends to conclude the battle. While doing so, Silvaren launches knives from every direction that appear to have materialized from nowhere.
The blades pierce Rukito's hands and feet while he deflects the majority. Rukito's incredible healing ability enables him to heal within seconds. Silvaren dispatches additional knives; Rukito is unaware that the knives are coated with poison. The blades stab Rukito's hands and feet as he dodges most with great speed. 

                                                 "You have reached your limit for now, since the toxin will inflict severe pain and leave you immobile, unable to act." "Let's finish this so I can help you heal." 

"Pain, if you think this is pain, you're sadly mistaken, as I don't feel a thing. As we speak, my body has separated the toxins mixed in my blood, so here's a little trick."

Rukito collects the poison in one hand as it hovers, then launches it directly at Silvaren before racing behind him at incredible speed, creating an afterimage. Capitalizing on the diversion he caused by slamming the ground, Rukito raises his adversary off the floor, rendering him vulnerable. 

Inside the mansion, Elia and Lysara can both sense the vibrations flowing through the structure. They dash out of their rooms, curious about the source of the sound. Lysara feels it is coming from her husband's private training area and makes her way there as Elia contemplates the situation. A girl with dark hair walks up to Elia, expressing her annoyance with the noise while Elia inquires where the sound originates. Lysara, the first to show up, witnesses a fierce fight happening, appearing worried until she observes the excitement and joy radiating from her husband and Rukito during this display of strength and skill. 

Rukito transitions to hand-to-hand combat, catching Silvaren off guard. While Rukito strategizes on how to end it, he experiments with a new technique he devised, named the Infinite All-Round Punch, in which he repeatedly punches and teleports around his opponent, landing a strike on every part of their body.
Elia and the girl arrive as Rukito performs his Infinite All-Round Punch. Elia is taken aback by what she sees, questioning why her father is battling Rukito, the boy she rescued. Everyone observes the extraordinary display of power, with the fight concluding when Rukito's final punch shatters Silvaren's sword, declaring Rukito the victor.

As I enjoy my victory, I turn to see Elia watching. It's good that she can see how strong I am, even stronger than her dad. Silvaren is also quite strong to last so long in a battle with me, and I got to see the abilities of an elf for the first time. Anyway, I better say something cool.

"With this, I'm now allowed to take you out of the house. So, how about it Elia? "

Rukito faces her, gazing directly into her eyes as she reddens. Believing that her curiosity about the outside world would lead him to confront her father, the mightiest elf globally, and emerge victorious. Elia contemplates the level of recklessness involved in daring a king, she reflects. In addition to her, the girl beside her appears equally captivated by him and his power.   

Due to my victory in the fight, Silvaren honored his agreement by revealing all the information I required and beyond. Here is a summary:

My Elven body and the changes.
  After becoming an elf, I still look the same for now, at least. Within a few years, my body will undergo changes, and I will inherit more elven traits. The more I train, understand, and use my abilities as an elf, the faster the process will be. Due to my lack of magical power because my magical circuits were stolen, leaving more empty space, it’s easier to fully attain an elven body in a shorter amount of time as long as I learn how to use Aether.

Reasons why the Tree chose me and what my position in all this is.
The World Tree has its own will, and when it decided to fall under the World Tree’s protection,    it also required us to follow certain rules and seek the World Tree for power, guaranteeing the elven race immortality. Every time the Tree gives half of itself to someone, that person becomes the next king's successor to the throne. The duration of a king's rule depends on how long the Tree allows the current king to live before appointing a new king to inherit and control the Tree's power.
With that said, I need to first fully become an elf on the outside before becoming king, as elves won’t accept a human ruler. Silvaren thinks the World Tree can see into the future, as each king chosen has only helped the elven race survive. After ruling the longest of his ancestors, the Tree needed change for what’s to come, and I was that change. He was right; as per my plan, I want to start a war. My original goal was to reach the top, and what better way to do so than to rule the world? I also have my own personal reason for war, and with the World Tree supporting me, I can do as I please to make this world a better place for myself and the people I hold dear.

                                         "Therefore, I grant you three years to rise as the next king." "I believe you possess the strength to defend the people, so utilize this training ground effectively and establish a purpose to assist this kingdom in achieving greatness."

"I, Rukito, will not disappoint you." "It is a privilege to receive your consent to take the throne." 

Rukito ultimately discovered a route to pursue in order to reach his objectives. With additional training, upcoming battles, and a challenging journey ahead, how will he confront what lies before him at this moment?  

I, Rukito, a 15-year-old aspiring for greatness, am presently facing a dilemma that may lead to negative outcomes no matter what I do. Why is there a girl sitting above me? I remember falling asleep last night, and now I see a girl—wait, looking down, I see she's completely naked!?