Sans returns after being missing for hours, revealing that he was in another universe where he encountered an "Ominous Man" who brought him back home. Sans shares his experience with Frisk and warns them about a new threat from someone named XGASTER, a powerful being who seeks to destroy the multiverse.
XGASTER appears and reveals that he has been manipulating events from behind the scenes. He offers to take Frisk to a new reality, but Frisk refuses, sensing that XGASTER's intentions are not pure.
XGASTER is joined by other alternate versions of familiar characters, including XAlphys, XAsriel, XAsGore, and XUndyne, who all seem to be under XGASTER's control. They declare that they will bring about a new reality, one where only those deemed "real" will remain.
Meanwhile, Mettaton and Muffet are dealing with their own issues, including an earthquake and a mysterious saboteur. The scene ends with the announcement that the city is under attack, and the characters must band together to stop XGASTER and his minions.
The story concludes with a poem from an unknown narrator, expressing feelings of emptiness and longing for a way to come alive. The poem hints at a dark and troubled past, with the narrator leaving behind "broken papers" and "bloody stains" that represent their shattered life.
Here are the key facts extracted from the text:
1. Sans was missing for hours and was found buried in the playground by a dog.
2. A law battle was postponed due to Sans' absence.
3. Sans tells Frisk about his experience in an alternate universe and his encounter with Cross.
4. Frisk is warned by Sans about a new owner who will take care of the "dirty work".
5. XGASTER arrives and claims to have come to taste Frisk's true power.
6. XGASTER reveals that he has the ability to overwrite the multiverse.
7. Chara, Frisk, and others discuss the implications of XGASTER's power and the danger it poses.
8. Ink appears and asks Frisk about their decision to refuse XGASTER's offer.
9. XGASTER's plan is revealed to involve the destruction of the multiverse and the creation of a new reality.
10. Mettaton is hosting a baking show with Muffet, but the show is interrupted by an earthquake.
11. XMTT and XMUFFET appear, revealing that they are counterparts of Mettaton and Muffet from a different universe.
12. Alphys and Mettaton discuss the sabotage of Mettaton's fire and the appearance of Muffet's gambler.
13. The city is under attack, and Mettaton orders Alphys to flee.
14. Undyne, Alphys, and others try to save the city from destruction.
15. Frisk decides to go to the city to help, accompanied by Papyrus, Undyne, and Toriel.
16. XGASTER comments on Frisk's decision, saying it makes his job easier.
17. The city is in danger of collapsing, and the group must hurry to save it.
Note: Some parts of the text are poetic or lyrical, and their meaning may be open to interpretation. The above facts are based on a literal reading of the text.