Notes:

Here are some quotes from the official HELP_tale summary document.

The Undertale multiverse, with splitting and branching AUs extending as far as one could possibly imagine, eventually comes to a stop. It wasn’t something that came out of nowhere for some denizens--after all, the “original” Sans spoke of reports that the timelines eventually stopped completely after a certain point.

But that wasn’t necessarily a cut-off point. Things didn’t cease to exist afterwards…but, rather, they merged. In a single instant, the multiverse reached critical mass and collapsed in on itself, forming the reality that we call HELP_tale: A place where all incarnations of all of our favorite Undertale characters attempt to exist in the same place in spacetime. It doesn’t go well.

More specifically, all of these “alt-characters” merge into entities we call ITs: Absolutely atrocious beings that put Undertale’s own amalgamates to shame, and rather than being the result of Determination gone wrong, they’re reality’s attempt to parse hundreds of souls inhabiting the same body. For every “major” character in Undertale, there exists one of these ITs: Sans, Papyrus, Undyne, Napstablook, Alphys, Mettaton, Toriel, Asgore, Frisk, Chara, Asriel/Flowey, the six fallen humans, and even Gaster.

The nature of this merge causes some of these ITs to behave in different ways that reflect the most consistent traits amongst a character in each AU. The ITs of Toriel and Asgore will end up fusing due to their inseparable nature in the fandom, the IT of Frisk ends up becoming HELP_tale’s playable character, and the IT of the six fallen humans ends up forming what is called the Locket, an item of pure determination. More information on the specific traits of each IT will follow later.