Have Mercy - UNDERTALE CROSSOVER AU (AftertalexHorrortalexAxetalexKiller!Sans)

What happens when a genocidal skeleton gets bored of his universe? When his only goal is to wreak havoc on the entire multiverse? To show all of existence no MERCY? How do you stop him? Easy, you give a silver tongued murderer the power to persuade him to go to the side of the multiverse where there is no MERCY to beg...

From Another World (PowerfulM!Reader x RWBY)

Y/N, an inter-dimensional hero. Y/N has become a complete legend in thousands of dimensions. Whether it is facing a monster, a disaster, a god, or other horrors, Y/N would always emerge victorious. Undefeated, unmatched.... Unbelievably tired. After spending much of his life fighting evil, Y/N wants nothing more than...