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

Underwing

AN: I was literally writing a new chapter on "The Animals Inside" and decided that the first time Frost opened a portal would lead to them falling onto a Sans that was mildly depressed and I kind of saw wings of something I was crocheting, so that's how Underwing really came to life! lol.
Edit: No depression for Underwing, except players trying to connect to Underwing! Yay!

Underwing:

Underwing is still alive, but it is very unknown in the multiverse that is my headcannon. (More like made dis many minutes ago. 🖐) Everyone has wings, some big, some small, and in multiple shades of blue. Both the wing size and the wing shade can be hidden, as well as the wings themselves, as the shade represents status or position in rule, and the size was the power the person had. For example, Asgore was the king and in charge of the underground, so his would be the highest ranking shade: navy blue. The lowest ranking, for example Sans(MV nickname is Feather) and Papyrus(MV nickname is Plume), would have a very light sky blue. The rest are sorted accordingly, very much like the system with pieces in Chesstale(Awesome AU). Asgore's wings, despite being in charge of the whole underground, where smaller than Feather and Plume's because of them being the judges of the AU. The AU itself welcomes people who listen to others, even people who willingly murdered their families, if those people were willing to listen to others' opinions, unlike a certain duo of skeletons *cough* Ink and Dream *cough*. The Bad Sanses were allowed in, Ink and Dream were not, Blue was, and of course, my OC Frost from the collapsed Animaltale was allowed. There was only one, meaning that this was an original, and that meant Error wouldn't target it. Not that Error would target it, it's his breakdown place where he can safely break down without risk of the Sans alerting the Stars, as Outer does. Everyone can use healing magic, but Feather and Plume's are stronger than everyone. Error introduced them to Nightmare and the gang and they became the Bad Sanses' emergency healers, more so main healers and became the people-that-the-gang-can-vent-to-and-break-down-in-front-of-without-needing-to-keep-their-guard-up type of people. Asgore and Toriel are not divorced, Asriel and Chara never died, the only genocide routes were when Player actually managed to gain access to Underwing, which was pretty hard. Asgore, Toriel, Chara, and Frisk from Underwing know about the AUs.

CHECKs:

Sans:

Name: Sans
MV: Feather

Species: Skeleton Monster

Wing color: Very light sky blue

Wing size: Largest size, 9 feet when spread out completely from start of wing to wing tip

LV: 3 (2 genocide routes managed to happen)

EXP: 0

HP: 3

ATK: 2

DEF: 2

Skills: Bone: Summons a bone that deals damage when touched
Blue Bone: Summons a Blue Bone that deals damage when not moving in it
Orange Bone: Summons an orange bone that deals damage when not moving in it
Gaster Blaster: Summons 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

Special Skills: Healing Magic: Advanced healing magic more powerful than the Toriel of this AU
Steel Wings: Reinforces wings with magic, making them sharp and hard, feathers becoming projectiles when not in use for flight, floating off and becoming dart-like
Karma Retribution: The higher the number of bad things done by the target, the higher the damage dealt to the target

*Lowest in rank, highest in power

*Usually hides wings

*Aware

*Royal Judge

*Knows Error

Papyrus:

Name: Papyrus
MV: Plume

Species: Skeleton Boss Monster

LV: 3

EXP: 0

HP: 50

ATK: 10

DEF: 10

Skills: Bone: Summons a bone that deals damage when touched
Blue Bone: Summons a blue bone that deals damage when moving in it
Bone Manipulation: Allows the user to manipulate and craft summoned bones into various things

Special Skills: Healing Magic: Advanced healing magic matching the power of the Toriel of this AU
Steel Wings: Reinforces wings with magic, making them sharp and hard, feathers becoming projectiles when not in use for flight, floating off and becoming dart-like
Karma Retribution: The higher the number of bad things done by the target, the higher the damage dealt to the target

*Second lowest in rank, second highest in power

*Usually hides power, but not rank

*Aware

*Royal Judge

*Knows Error

Error was fatally injured and opened up a portal to a random AU, landing in Underwing where he met Plume, who brought Error to his and Feather's house after Error fainted from his wounds. Feather is slightly suspicious because Error is the (forced) destroyer and Ink told the entire multiverse that he was dangerous via a multiversal speaker for those aware of AUs. So Feather keeps his guard up while healing Error, Plume having already tried but not managing to heal all of Error's injuries. Error wakes up around 2 hours later, and immediately jumps up onto the ceiling, hanging from his strings and hissing at Feather and Plume, to their amusement. After a few hours of convincing Error that they were not a threat and to come down, Feather and Plume started explaining on what happened, how he got there, and what they did. They also managed to get Error to eat something, |Me: Surprise, he didn't eat the utensils!| and after he ate, they asked him what happened. He was ambushed in Outertale when he was relaxing by Ink and the originals, which meant he couldn't dust Ink's allies that were fighting him at that time, since it would mean all their copies would collapse. Feather and Plume were the judges of Underwing, so they understood and offered their AU to Error as a sanctuary, protecting him from Ink as Ink forgot about Underwing.