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Description
So, you may immediately be confused on what the hell this is, and to properly introduce you to everything about it, I gotta first explain a shit ton of headcanons

So, in some ways, Undertale itself is not a single universe, but instead a multiverse. How? Well, while yes it has many timelines, some are so distinct like Dusttale and Horrortale that they could be called their own aus. This when applied to other aus and their timelines as well, means the Undertale Multiverse as we know it is technically a Megaverse, since a Megaverse contains multiple Multiverses.

Thats not all, and time for the second headcanon related to this. When talking au combos, a grand chunk are technically their own connector multiverses. For Tale Timeline AU + Other AU combos, there is only one of these connectors, for example, there is a singular Tale + Fell connector multiverse that contains aus like Dustfell and Horrorfell (NOTE, IM NOT SAYING THIS MEANS DUSTFELL AND FELLDUST ARE THE SAME AU, FELLDUST IS A DUSTTALE TIMELINE IN A UNDERFELL AU, SO ITS ONE OF THE AUS IN THE FELL MULTIVERSE CLUMP), but for the Swap AU + Fell AU clumps, there is to, one is the Swap Au + Fell Au clump, containing stuff like Swapfell, Swapdustfell, Swaphorrorfell. Meanwhile the other is the Fell AU + Swap AU clump, containing aus like FellSwap, FellDustSwap, FellHorrorSwap. This order of pairs rule applies to all sorta of multiverse combo au clumps, from possible Fell + Shift combos, to Swap + Negative combos. While this chart only uses the Undertale clump, 5 main au clumps, and their connector clumps, this can easily be applied to EVERY singular au out there, as well ad any au combo you can think of.

I didn't even include this one since it would make things even more complex, but connector clumps can have other connector clumps as well that tether them closer to one particular au, and these also work in order of pairs except when talking about connectors to the tale clump. for example, there is a Swap + Fell + Swap clump that contains aus such as SwapFellSwap, SwapDustFellSwap, SwapHorrorFellSwap, etc.

This is very complex, and ultimately VERY pointless, but I like this idea since it adds a whole new layer of science in a way to the undertake multiverse.

I didn't even include my idea on how minus aus fit in all this!

While I attempted to use yellow lines to connect everything to make things less confusing, I ultimately had to use darker yellows to avoid overlapping lines

Undertale belongs to Toby Fox
Underswap belongs to AU Community
Underfell belongs to Fella
Negatale belongs to Artsygum
Every other au here belongs to their respective owners, I probably accidentally created a few with this chart lol

Description
So, you may immediately be confused on what the hell this is, and to properly introduce you to everything about it, I gotta first explain a shit ton of headcanons

So, in some ways, Undertale itself is not a single universe, but instead a multiverse. How? Well, while yes it has many timelines, some are so distinct like Dusttale and Horrortale that they could be called their own aus. This when applied to other aus and their timelines as well, means the Undertale Multiverse as we know it is technically a Megaverse, since a Megaverse contains multiple Multiverses.

Thats not all, and time for the second headcanon related to this. When talking au combos, a grand chunk are technically their own connector multiverses. For Tale Timeline AU + Other AU combos, there is only one of these connectors, for example, there is a singular Tale + Fell connector multiverse that contains aus like Dustfell and Horrorfell (NOTE, IM NOT SAYING THIS MEANS DUSTFELL AND FELLDUST ARE THE SAME AU, FELLDUST IS A DUSTTALE TIMELINE IN A UNDERFELL AU, SO ITS ONE OF THE AUS IN THE FELL MULTIVERSE CLUMP), but for the Swap AU + Fell AU clumps, there is to, one is the Swap Au + Fell Au clump, containing stuff like Swapfell, Swapdustfell, Swaphorrorfell. Meanwhile the other is the Fell AU + Swap AU clump, containing aus like FellSwap, FellDustSwap, FellHorrorSwap. This order of pairs rule applies to all sorta of multiverse combo au clumps, from possible Fell + Shift combos, to Swap + Negative combos. While this chart only uses the Undertale clump, 5 main au clumps, and their connector clumps, this can easily be applied to EVERY singular au out there, as well ad any au combo you can think of.

I didn't even include this one since it would make things even more complex, but connector clumps can have other connector clumps as well that tether them closer to one particular au, and these also work in order of pairs except when talking about connectors to the tale clump. for example, there is a Swap + Fell + Swap clump that contains aus such as SwapFellSwap, SwapDustFellSwap, SwapHorrorFellSwap, etc.

This is very complex, and ultimately VERY pointless, but I like this idea since it adds a whole new layer of science in a way to the undertake multiverse.

I didn't even include my idea on how minus aus fit in all this!

While I attempted to use yellow lines to connect everything to make things less confusing, I ultimately had to use darker yellows to avoid overlapping lines

Undertale belongs to Toby Fox
Underswap belongs to AU Community
Underfell belongs to Fella
Negatale belongs to Artsygum
Every other au here belongs to their respective owners, I probably accidentally created a few with this chart lol