Split (Nightmare x SwapDream) by KurilianCharlie on DeviantArt

Undertale AU) OCs - Dream! Sans - Wattpad

Nightmare Sans on

DRYEMIDDI — VANTABLACK ( NIGHTMARE ! INK ) - Character Info!

nightmare story AU — nightfright sans and nightmare papyrus

Reference Sheet: Ephialtes by WishingStarInAJar on DeviantArt

☆ NIGHTMARE CASTLE ☆ An Undertale AU Dating RPG

Underdew Nightmare by Miscneilleaneous on DeviantArt

Cresent Sans, Wiki

WishingStarInAJar ✨🫙 on X: Remember this guy, my Nightmare Ephialtes? @PudgyChee asked what he looks like when he is severely weakened. Welp, like this! An angry cloud made of black smoke

So I made Nightmare Sans. (ref pic not mine) : r/GachaClubAndroid