What Evil Causes (Book 3, Finale)

Eris' Pet

3rd POV
Yang helped Y/N into the hospital bed as he was still throwing up the black liquid.
Y/N: Yang! I don't feel so good.
He threw up the black liquid on her going from her chest to her boots.
Yang: ew!
Y/N: ...sorry.....
Yang: don't worry about, I'll yell when you're better.
Y/N: I'm honored
Y/N threw up again but this time his arm transformed into Yasei's arm.
Y/N: the hell?
He turned his arm back to normal.
Y/N: this is not good, w-what's happening to me?
Yang: I don't know baby, just stay strong, we'll get through this.
The waves outside got worse and they only got higher, a plume of water shot out of the ocean, revealing the beast Eris sent, the Kraken.

(All credit goes to artist)
It slammed its tentacles on the buildings and roared loudly. Y/N heard it and tried getting up.
Yang: no way, you can't fight.
Y/N: I got this.
Yang: bed, now, the team will take care of it, wait here and don't move.
Y/N: really going into battle with black up chuck?
Yang: don't bring it up....it smells and it's squishy.
Y/N: as t should be, I'm heading out.
He then threw up the black liquid again and his eyes began tearing blood.
Y/N: I got this!
Yang: sorry Y/N.
She punched him in the face, knocking him out.
Yang: you'll forgive me.
She ran out to the front of the hospital, Y/N's left hand started hardening and becoming pointed.
Yang: what's going on?
Blake: giant monster, I assume Y/N wanted to fight?
Yang: yep, don't worry I knocked him out.
The hospital ceiling then busted upwards as a giant monster broke through and roared.

Team RWBY turned around to see the giant Y/N became.

Yang: Y/N?
Y/N roared into the sky and went to the body of water behind him, raising the water even more, causing light floodings on the street. The Kraken was looking around for Y/N, since he just disappeared in the water without a trace. From behind the Kraken, Y/N jumped out of the water and bit down on its neck. The Kraken roared in pain as it wrapped its tentacles around Y/N, trying to choke him. Y/N let go and was starting to choke, he then used his arm and stabbed the Kraken in the shoulder, making black blood fly out. Y/N roared as he brought the Kraken underwater, making it roar in pain. Yang ran towards the fight.
Ruby: Yang No!
Y/N rose out of the water and his head was slammed into the ground and slid into buildings. The Kraken rose from the water and stabbed Y/N in the back making him roar in pain. On one of the building tops Eris was watching.
Eris: good my pet.
Y/N continued roaring, his head was then picked up and slammed down again.
Yang: Y/N!
Y/N opened his eye to see Yang running towards them.
Yang: you can do it Y/N!
The Kraken roared at Yang and slammed its tentacle down by her, a small one then wrapped around her leg and pulled her up. Yang quickly punched it but they began swarming her. Y/N saw this and his eyes went from e/c to pure white. He then roared in anger, everyone in Vale looked in the direction with Y/N, he slammed his hand into the ground and lunges off, biting the head of the Kraken. Yang looked at Y/N as she was being wrapped and smiled.
Yang: go get him babe.
Y/N roared again and jammed his hook hand into the Kraken's throat and made it come out its stomach. It completely went limp, dropping Yang into the ocean and sinking. Y/N continued ripping the Kraken apart until finally it was nothing more than a black puddle. Y/N looked over at Yang who climbed out of the water completely soaked and she smiled at him. His eyes turned back to normal color and he roared into the sky, much to the dismay of Eris.
Eris: to think he was gonna die....let's see, ah yes the girl, I'll be visiting her real soon.
Y/N turned back to normal and he went to one knee, he threw up the black liquid again, but it wasn't as bad as before. He then stood up and smiled. Yang ran up to him and hugged him.
Y/N: ballsy move you had there.
Yang: it didn't go entirely according to plan love.
Y/N: I can believe that.
His veins returned more to their normal color, still blackened though.