Their meeting has been set up by the Universe, and it seems like the two of them know that fact too. So, when Lavi and Theo met each other... They're not really that shocked to see one another. Although, they are a bit taken a back by the amount of power that they each hold...
'I didn't think that he would have another way to up his power level... This power is not that of a Qyblith... So, I can only think that the Titan has a hand on this matter...' Lavi thought after analyzing Theo's threat level.
While Theo, after assessing Lavi's level of threat himself, thought 'I didn't expect him to actually fully regain his full power. Wait, no... It's not the same... He's already ascended his power level... This level of his is not a God level anymore, it's ancient being power level...'
But the two of them think of the same thing. 'This fight is not going to end with the universe on the same state!' After all, the two of them are now in the similar level of an Ancient Being. If two Ancient Being fought, the universe is at a threat of collapsing. If the two of them are not careful with their own power, everything that they're working towards, will fall down the drain, rendering everything they do meaningless!
After assessing each other...
Lavi is the first one to made his move. He quickly leap forward toward Theo. But Theo is also quick to react to Lavi's advance. As Lavi swung his hand toward Theo's head, trying to sliced it with his own hand, Theo blocked Lavi's hand and grab that right hand of Lavi with his left...
It's not over with just that, because Theo grabbed Lavi's hand, he pulled it and immediately got in the prime position to counter Lavi's advance. So, he did. He quickly moved his knee and attempted to slam his knee toward Lavi's chest without pulling it. Although the power is not as great as a normal knee, it's still pack a punch and Lavi quickly slap Theo's hand and goes back a couple of steps.
Lavi's chest throb but that feeling immediately disappear as his regeneration kicks in.
"Hm... I'm surprise that you really attempted to attack me without any of your weapon, God of the End. That's very brash of you!" Theo declared. Lavi quietly sigh and just take his form once more.
"I see, so no more words from you to me? I get it." Theo responded to that by taking his form himself. But then... To his surprise.
Lavi suddenly appear right in front of him and his fist is already in front of his eyes... Around Lavi, the aura of lightning is going crazy...
"I indeed have no words for you. But for your sake, I'll say this... Whatever happened to you earlier, is the worst decision you ever made in your life!" Lavi says that as his fist hit Theo face clean.
Theo was blown back, but as he was blown back, he managed to swing his foot and hit Lavi's arm. The sound of bones cracking came from both sides.
With Lavi's arm cracking and Theo's temple getting crushed...
"Tch, I still managed to get hit huh... Didn't see this coming." Lavi muttered in disbelief. He definitely didn't expect to get hit by Theo's counter like that.
While Theo, he just hold his head and revert time back to the point where his head is normal.
"Phew, that was close. A little bit more and my brain would suffer some irreparable damage. The God of the End really stays true to its name huh! Trying to end me in a single attack!"
Lavi just blurted and chuckle... The Lightning aura around him disappear and he stared at Theo seriously while also seemingly looking at him like 'Are you serious?'
"If you really think that I'm trying to end you, you're mistaken. I didn't try to end you. Because, if I end you right now, your backer would go after my ass and that would lead me to have an even bigger problem."
"Hoo? Then for what purpose are you here?"
"... To beat the living s**t out of you fucktard!"
Lavi once again leap forward toward Theo, But this time, he's more careful and leave no room for any counter whatsoever. There's nothing that Theo can do to hurt him even if he wanted to hurt him.
So, Theo do what any rational being would do. Back off and gain a bit more space before forcing an opening to counter.
Lavi knows Theo's tactic, so he purposefully let go of any intention to defend and let his entire body be open. There's nothing else in Lavi's mind other than 'Imma beat the living hell out of you to the point that you wished you want to die!'
Theo was... Dumbfounded. Overwhelmed with the choice Lavi's made. The amount of attack that suddenly came to his head turn his brain dumb and he only stood there dumbfounded.
"Although you are a powerful god, Theo... In the face of me... Your power is nothing more than a play pretend!"
Lavi aura suddenly intensify to the point that it choked Theo who's in the same level as him. There's nothing that Theo can do to let go of that choking feeling...
A black crown with different element jewels appear on Lavi's head. It's the thing that pushed his power over the limit of what a god can be and made him ascend to the level of Ancient Beings...
"Tell Titan this. If you want to kill the Ancient One... Then do know that you're dealing with me next. I don't know if you want that!"
Lavi's hand turned black with the essence of the end itself... Then, he slam his palm straight toward Theo's Chest and Theo suddenly disappear from the space around him...
"Well then... I've done what I must. This is something that I must do to ensure our survival..."
Although the fight is short, the winner is clear. It seems like Lavi has other plan and he succeeded in making sure that the way the world is going right now is according to his plan.
"But the next time we saw each other... I will kill you and Titan."
Lavi turned back and then went straight back to his world and beloved one.