The group:
#KingdomtaleAU (https://www.deviantart.com/kingdomtaleau)
Kingdomtale is an AU in which all monsters did not support King Asgore's resolution to remain peacefully underground. Some of them, in their frustration and discontent, splintered off, and followed the former Royal Scientist, W.D. Gaster, as he loudly proclaimed his opposition to this quiet acceptance of the fate of monsterkind.
Consequently, the Underground was split into two Kingdoms; the Kingdom of Dreemurr and the Kingdom of Gaster. Recently, a third, tiny and relatively harmless kingdom has also emerged.
One day, a human falls into the Underground. If that human ends up in the hands of King Gaster, then