ans is the final boss of the Genocide Route. Similar to the Neutral and Pacifist routes, he waits for the protagonist at the Last Corridor. However, he skips LOVE judgement, apologizes to Toriel, and begins an encounter.
Sans alters the SOUL Mode to Red or Blue and uses White and Light Blue Attack Types. He uses various complex bone patterns, straight beams from "Gaster Blasters," and telekinesis. Excluding telekinesis, Sans's attacks inflict KARMA, a mechanic that hurts the players HP over time