After Alphys got impaled by the bone, another monster appears. It looked like a robot but that didn't matter to Izuku. He made quick work of the robot, shooting it down with a gaster blaster like it was nothing. Now that he had finished Alphys and the robot, he makes his way to New Home.
Time skip~
Izuku enters the throne room to see Asgore tending the flowers. Asgore notices that someone is behind him and turns around. Asgore says "Oh hello Sans. What can I do for you." Izuku traps him in blue bones and says "Sorry but I must do this, it's to stop the human." Then he sends a purple bone and fires a gaster blaster at Asgore. Seeing Asgore turn to dust, Izuku is now ready to face Frisk. He walks back to Judgment Hall and waits for Frisk to arrive.
Time skip~
Frisk walks into Judgment Hall, they start looking around to see Izuku but they are met with a purple bone flying past them. "So you finally arrive, you took your sweet time." Said a voice who sounded angry and disappointed. They look up to see Izuku riding a gaster blaster, Izuku says "WE ARE GONNA HAVE A MAD TIME!" He fires the blaster but Frisk dodged it, he then fires purple bones at them in rapid succession. Once Izuku manages to pin Frisk down, before ending this madness Izuku says "Now you can no longer continue the loop." He sends a purple bone through their chest, finally killing them. He notices that they don't reset so he begins thinking "Did I actually manage to end it?" He waits a bit longer then it hits him "Oh shit I actually did it. But I can't reset the world or they would come back." Now he is left alone in a world full of dust and emptiness.
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Deku as Dust Sans
FanficThis is a My Hero Academia crossover with a Undertale AU Dusttale. It's about Izuku Midoryia being sent to the Undertale AU Dusttale but with a twist there is no Sans in this verson of Dusttale, Izuku is Sans.