Sans, has endured many resets (99 to be exact) after a glitch in the timeline, he finally remembers everything, every reset, even to the minor details, he remembers everything. After this new knowledge he obtained, he goes on to defeat the human (Frisk) and absorbs they're soul acquiring new abilities specifically They're SAVE and LOAD abilities after the battle with the human he goes to the barrier to give Asgore his soul, but...Asgore is nowhere to be seen, instead he finds the first fallen human Chara, Chara gives Sans an opportunity to end all of these resets and offers Sans they're soul and the ability to travel between Alternate universes, at first he is unsure about how to feel about this, eventually he absorbs charas soul, gaining New abilities like the Real Knife and Locket! , after that, he roams the multiverse and goes to alternative universes to find other flavors of ketchup! ✨