RWBY: Dark Aura

A RWBY x Male Rose-Uchiha OC fanfiction. I do not own Naruto or RWBY. Both belong to their respective creators. I only own the OC and how this story goes about.
Beacon Academy is meant to be a place where Huntsmen are forged-
where hope stands against the endless darkness of the Grimm.
For Ruby Rose and Yang Xiao Long, Beacon is also a fresh start...
a chance to move forward after the loss of someone they believed was gone forever.
Years ago, during a Grimm attack that should have killed them all, their elder brother Damien vanished-
last seen standing between them and certain death.
Declared dead.
Mourned.
Never forgotten.
Now, as the sisters step onto Beacon's grounds to begin their journey, they notice something that shouldn't exist.
A man dressed in black.
A wolf-shaped helmet hiding his face.
A presence that feels wrong-and yet painfully familiar.
Accompanied by three others just as dangerous and enigmatic, the man watches Beacon from the shadows...
his aura dark, controlled, and unlike anything the world of Remnant has ever seen.
Unbeknownst to them all, Damien Rose-Uchiha lives.
Changed by survival.
Hardened by loss.
Bound to a power that does not belong to this world.
As Grimm grow more aggressive, secrets begin to surface, and Beacon becomes the stage for something far greater than training exercises, the line between light and darkness blurs.
Because not all monsters are born from Grimm.
Some are forged by sacrifice.
And when the truth finally comes to light, Ruby and Yang will be forced to confront a single, terrifying question:
What happens when the brother you lost...
returns as something far more dangerous than the enemy you fight?