Kaido looked at Seth who was fast approaching and he flew up above to dodge Seth's attack.
*Swish!*
Seth slashed on the air. he then looked above and saw Kaido who was planning to attack him.
After dodging Seth's attack Kaido took a deep breath and shot out a powerful wind blast towards Seth.
"Dragon's Breath!"
Seth didn't evade Kaido's attack but chose to attack head on using his Mega Basilisk to counter Kaido's dragons breath.
*BOOOM!*
The two powerful attacks collided creating a huge shockwave on the sky.
"Not bad rookie, but don't think that you're strong enough to defeat me." Kaido said while looking down on Seth from above.
Seth glanced at Kaido and replied "Tsk tsk. I didn't thought that you're this confident on defeating me, I still didn't even use 40% of my power."
As soon as Seth finished his speech wind and lightning started to converge on Seth's spot.
*BANG!*
Suddenly a huge lightning struck down on Seth.
Seth then looked at Kaido and smirked, his whole body was now covered with wind and lightning.
"I haven't used this form in such a long time. so I hope you could put up a good fight against my berserk form Kaido."
*Bzzzzt!*
Seth suddenly disappeared from his spot, Kaido was shocked seeing Seth's form he already heard about from his subordinate but he didn't believe that it would be such a powerful form.
While Kaido was still trying to pin point Seth's location, he was suddenly struck by a lightning kick by Seth in his abdomen.
*BOOOM!*
Kaido clenched his stomach and is trying to fight back from throwing up.
Seth then appeared in front of him with a huge smile on his face.
"Looks like that kick really hurt Kaido, I'm really disappointed with you I thought that fighting a dragon would be so cool but it looks like youe just an over grown lizard." Seth mocked Kaido and shook his head in disappointment.
Kaido was enraged hearing Seth belittle him and immediately dashed towards Seth trying to bite him.
Seth already knew that Kaido will attack him after bding humiliated so he disappeared from his spot sain and appeared on top of Kaido's head.
He then started to converge wind and lighting on his hands and attack Kaido in the head.
"Destruction Blast!" *BANG!*
Kaido was struck in the head and he crashed down on Onigashima Island.
*BOOOM!*
The entire Island shook when Kaido fell, his forces were shocked seeing their emperor fall from the sky.
King and Queen who were fighting Tesoro and Gerhadt didn't look worried at all and was still focused on fighting their opponent.
Kaido who was struck down by Seth returned back to his human form he stood up and jumped out of the huge hole.
He looked up to Seth and laughed "Hahahahaha! This is great I finally found a worthy opponent who can battle me head on!"
Kaido then started to release a black miasma from his body and grew bigger, his skin turned black and his horns grow longer, his eyes were now pitch black and he had two huge fangs.
Seth was dumbfounded seeing this and couldn't help but ask.
"What exactly are you?! Didn't you ate the Mythical Dragon-Dragon fruit model: Eastern Dragon"
Kaido laughed seeing Seth's shocked expression and said "Who told you that I ate the dragon-dragon fruit? Haven't you realized that they call me "The Strongest Creature" It means that I am not human. I am the last descendant of the Dragon clan! I am born a Dragon! I didn't ate any dragon fruit. My devil fruit is the Rare Mythical Demon-Demon fruit model: Oni (Ogre)"
Seth was stunned hearing Kaido explain his origin and devil fruit. he didn't expect that there are Dragons who can tranform into a human being in the One Piece world.
The reason why I came up with this idea is because I don't believe Kaido ate a Dragon fruit.
I got the Oni idea from the name "Onigashima Island"
I wanna put some of my prediction in this novel hope you enjoy!!