My AUs (that were totally not made last minute just for plot)

Animaltale

Animaltale is my main AU, included in most of my stories as part of the Bad Sanses.

Animaltale:

Animaltale used to be a flourishing AU where residents of the underground weren't underground but instead sent to live near the mountains, with a barrier to ensure they wouldn't leave the mountains. The mountains had magic in the air and food sources, so the residents wouldn't starve like Horrortale, but the residents could also change into animals. Most residents could only change into 1 animal, some into 2, and lucky ones into 3. The animals were split into categories:
Small: These animals consist of mice, squirrels, and other rodents. Birds are also included, and this class is usually used to scout out enemy bases or sent to infiltrate something, due to them not being more than as big as 3 phones lined up side by side, completely flat. They are powerless and only have enhanced intelligence.
Medium: These animals consist of foxes, dogs, and other feline-like creatures. This included eagles, snakes, and other creatures relatively sized around 2 foxes side by side. They are powerless and only have enhanced agility.
Large: These animals consist of lions, pythons, boa constrictors, and other animals up to size. Kangaroos are also included in this category, as they are around the size of a lion at its prime size. They are powerless and only have enhanced strength.
Mythical: These animals are exactly what their category title suggests, they are mythical creatures. The only known ones in this list are griffon, dragon, phoenix, kitsune, nine-tailed fox, pegasus, and nightbird. There will be a later section dedicated to the powers.
Zodiac: These animals are simply those of the Chinese zodiac; the rat, the ox, the tiger, the rabbit, the dragon, the snake, the horse, the sheep, the monkey, the rooster, the dog, and the pig. All of these have a galaxy theme so as not to confuse them with others. There will be a later section dedicated to the powers.

The Papyrus of that AU could change into three animals: fox, snake, and phoenix. The Sans of that AU can change into all types of rodents, birds, and furry wildlife friends found in the wilderness. They can also change into all classes, and I might have made them OP. Oops.

This AU eventually collapsed due to Ink fighting Error. Error had sensed a glitch and came to fix it. Ink being the asshole he is in my main head canon decided to attack Error, thinking he was there to destroy this AU. However, it's his attacks causing more damage than Error's, who is desperately trying to save this AU. He gets distracted by the Sans, and Ink gets a hit just as the AU starts to collapse on itself. During this time, the Sans had made a magical companion named Flame and learned how to make portals. The destinations are random, but he can't worry about that now and makes a portal under him and the injured Error, bringing them to an abandoned Dusttale copy. There, Frost starts to heal Error up and sees Error's SOUL. As a result, they forget all memories of Error, and Error's memories of the Sans become hazy.

CHECKs:

Sans:

Name: Sans
MV: Frost

Species: Skeleton Boss Monster

LV: 1

EXP: 0

HP: 12

ATK: 5

DEF: 5

Skills: Bone: Summons a bone that deals damage when touched
Blue Bone: Summons a blue bone that deals damage when moving in it
Orange Bone: Summons an orange bone that deals damage when not moving in it
Gaster Blaster: Summons a large skull that blasts a beam of magic that deals damage when touched
Blue Gaster Blaster: Summons a large blue skull that blasts a beam of blue-colored magic that deals damage when moving in it
Orange Gaster Blaster: Summons a large orange skull that blasts a beam of orange-colored magic that deals damage when not moving in it
Blue Magic: Turns the SOUL(s) of the victim(s) blue, which then allows the user to affect their gravity and throw them around
Ice Magic: Summons attacks such as icicles, snowballs, and explosive snowflakes that don't melt out of thin air