The readers battle uniform will be like this

okay story of the reader when the reader was born he was born with the butt of Satan

After many years the reader's butt have to take over and ask him to fight one of the deadliest creatures on earth by only using his butt and chest the reader have fought over crocodiles to seals, bears. Elephants , loins ,and two gorillas.

Air force nipple punch : by flexing his chest muscles so fast and hard the hit of the chest almost feels like a punch made out of air

Butt shot gun:when using his butt he can cleanse his butt muscles and realize a powerful hit that makes a shot gun sound when impact.

Butt death roll:  something like this but using his butt

Death call : the aura of his butt will show the face of the grime reaper

Satan rage: the reader will be full of rage that his eyes turn red and veins pop out of his body.

Satan chest: some eyes  and  mouth will appear too the chest I of the reader making his attacks stronger.

Speed hell: the reader will move around so fast that it looks like their are multiple of him.

True Satan : the butt will take control and transform the reader into a moster.

OmegaNexus52 you can do some changes if you like.