( Yuuki's POV )
Yuuki: Hey kid, you should reconsider. Being my enemy isn't something I recommend. Vali: This is my path to my destiny, there's no way around it.
Yuuki: Destiny? You're not going to repeat that bullshit talk about the new world order.
Vali: Don't lump me together with that woman, what I'm looking for is the throne of the demon king.
Yuuki: oh Seriously, how is that your destiny?
Vali: Birthright, my full name is... Vali Lucifer, descendant of the original demon.
After revealing his lineage, Vali sprouted demon wings and his power soared higher than when he began his attack against the mages, the direct relationship with the original demon surprised the devils beside us, but the rest remained calm because Vali still had more dialogue to give.
Azazel: A direct descendant of Lucifer and a half-human who received one of the most powerful Sacred Gears—that's almost a joke in terms of probability, he is probably the strongest vanishing dragon in history.
Yuuki: hey now, He doesn't need any more ego boosts.
Vali: It's not a coincidence I was chosen by destiny, compared to that, the red emperor, Issei, you are simply disappointing.
Issei: Hey, what's your problem?
Vali: You are a devil now, but what were you before? A simple human, no magic, no talent, no direction; Perhaps I should kill your parents and make you an avenger; that should be appropriate motivation for my destined rival.
Issei: What did you say, you bastard!!
[Overboost!!] [Balance breaker!]
Vali's words achieved their purpose, and completely enraged Issei, he activated his balance breaker and was going straight for Vali, but before he flew away, I put a hand on his shoulder to stop him.
Issei: Sensei?
Yuuki: Don't let his words get to you, this isn't the place or time for you two to fight.
Issei: But Sensei—
Yuuki: Trust me here, have I ever failed you?
I gave Issei a confident smile, and after a few seconds my words managed to calm him down, Issei deactivated his armor, and I slowly rose to Vali's height.
Yuuki: You really need to work on your personality, brat *snap*
There were still some minions around us, so I snapped my fingers and created glintstone phalanx that filled the sky; the energy swords erased the rest of the minions, and many swords were also aimed at Vali, but these disintegrated before they could touch the white dragon.
Yuuki: You want Issei to be a worthy rival for you, but as his Sensei, I have my own test for you.
I wanted to test the supposedly strongest white emperor in history, and I started by shooting a Bala, a weaker and smaller version of a Cero, Vali was able to cancel the attack with an energy blast, I was waiting for that and then I appeared behind Vali.
[ Divide! ]
Before attacking, I suffered the effects of Vali's Gear, an ability contrary to Issei's that divides the enemy's power and that power is absorbed by the Gear user.
I immediately regained my lost power by activating my Hollow mask. The excess energy he absorbed from me came out of Vali's wings to push me away, but it didn't affect me, I punched him, sending Vali flying far away from me.
Vali's armor cracked, but I stopped the attack when I heard the dragon soul voice inside Vali, the dragon emperor Alvion.
Alvion: [ Vali, you'd better not hold back, he's the only one playing around here, maybe you should consider escaping. ]
Yuuki: [ too late for that. ]
[ Divide ]
I fired a devastating cero and Vali used his power splitting ability again. I knew he was going to deflect that attack, and I appeared above Vali and returned the blow he used on Azazel, I hit him on the head, sending Vali crashing to the ground.
A huge crater and a screen of smoke formed beneath me, and before that smoke dissipated, multiple spheres of energy flew toward me, I took out my bone tails and they moved around me like a defensive sphere that deflected Vali's attacks.
Then I dove and when I entered the smoke screen I threw a punch that collided with a kick from Vali.
A shockwave was created by our impact and the cloud of smoke was blown away, With the scenario clear, I noticed the cracks in Vali's armor that resulted in the deactivation of his balance breaker.
Vali distanced himself from me and I deactivated my Hollow mask. Vali maintained his conceited expression, but one of his arms and leg were somewhat trembling after our little encounter.
Yuuki: You don't look well there, buddy. Do you need a break?
Vali: Hmph Don't even think about it, things are getting good, something Issei at least did well was choose his master.
[ Divide! ]
Vali's ability guaranteed that he would have energy as long as his enemy did, but that didn't mean he had infinite stamina.
Vali activated his armor and went for another flurry of punches and kicks that I blocked with one hand, the sound of [Divide] sounded with each blow but I always maintained the same level of power.
That was because by only using one hand to block, I could absorb natural energy at rapid levels.
This battle was now one of endurance, and when cracks appeared in Vali's armor, I threw a punch at his chest that completely shattered his armor, I knew I could activate his armor again, so I drew the Ascalon sword that Michael gave me and appeared behind Vali, with a clean swing, I cut off one of his wings, which was the main part of his sacred gear.
Vali fell to his knees as if all his power had been sucked out of him.