In a nutshell, Ink makes a soul, absorbs it, becomes more childish, Dream takes care of him, then Error notices, then becomes like a sibling to Ink, Dream struggles to take care of both, Nightmare appears and agrees on taking care of them and then the "Star Sans's" and "Bad Sans's" names are now eradicated from the au itself. Cross and Blue formed a brotherly bond and now after a while everyone's underground and trapped. Ink and Error d i e and then Nightmare becomes depressed af and decides to kill the humans that fall, Dream was disgusted by this and ran away to the ruins