SW!Fallenswap - Undertale A.U

This is an A.U I made, it also has a sound track on online sequancer, and an animation on my Youtube account Sariel's world Ella.
This A.U is kinda depressing and can get kind of morbid at times, so reader discression is advised.
In a torn apart underground where you can't trust anyone,
A boy trying to save his sister for trying to attempt the same thing that Chara managed to pull off, return from mt. Ebbot alive, the boy falls down and attempts to bring trust back into the underground