RWBY: Eradicator of the multiverse

On the planet of Remnant, to the west of Vale, lies a small island known as Patch. There lies Signal Academy and the home of Y/N Rose, the middle brother of Yang Xiao Long and Ruby Rose, and the son of Taiyang Xiao Long and Summer Rose.

One fateful day, when Y/N, Yang, and Ruby were playing outside their home, (Y/N) was sucked into a portal that opened. Yang and Ruby were in distraught that they're brother was taken from them. Taiyang and Summer feared that they had lost their only son.

Years later, the very same portal that took Y/N, sends the very same boy back, but he was altered by the worlds on the other side of the portal.

The portal lead him into multiple different universes where he will make dozens of new friends as well as enemies, and even one's who he will call "Family". Y/N, Now known as "Eradicator MK II+", became a more powerful individual than any Atlas Operative on Remnant.

Now back home on Remnant, Y/N finds himself in the Emerald Forest during the initiation into Beacon Academy, when he spots both of his sisters all grown up and flying above him.

How will Y/N reunite with his sisters after being gone for so long?

How will Yang and Ruby react when they find out Y/N has returned as a hulking grimm killing machine.

How will the events of Remnant change when Y/N goes all out with his new power?