Undertale Ultimate Timeline the official novel

the universe. it's ever expanding. and with it, billions of dimensions and universes. but now... it's under threat.

8 years after freeing the monstors and becoming the ambassador of them, Frisk, now 16, gets sent through to another world alongside a few of his friends. however, he soon realizes that there is a bigger evil out there.

with the help of the au's guardian, Ink sans, he sets to unite several AU Sans and Frisks to join together to defeat whatever is threatening their multiverse.