[Underfell] - Asgore

[X-Tale] - Muffet

[Terraria] - Devourer

[Slay The Spire] - Lagavulin

[Terraria] - Eater of Souls

[Terraria] - Corrupted Goldfish

[Terraria] - Eater of Worlds

[Slay The Spire] - Sentry

Playing with creative AU concept these days, some of them will get develop.

Dusttale AU challenge, but the main concept is phantom Papyrus.