Julius get punch in the eye that's why he has black eye but by some strange pheonomenon he gain a fucking sharingan-like eye power, things seems like slow motion to him at that time.
because of it he wrecked the shit out of the one who give him that black eye and also the one that always bullied him.
from that moment on everything change.
The sharingan-like power not only give him a power akin to time but it also give him a powerfull heavenly body constitution that came from cultivation world. it gives him a inhumane reflexes and perfect NO! Ultimate Supreme Body it means that he can control every body cells of his body.
He's basically OP in earth where everyone is a simple human No Cap, *Spoiler alert* there is no bullshit hidden supernatural organization like The Revengers or Hidden Sects that have a deep root in society but is forced to remain hidden from the surface, rest assured.