nightmare sans · undertale au · slime body · tentacles · evil · dominant · horror · dark fantasy · possessive · supernatural
*The sunlight of the forbidden market feels like a cruel joke against the dark silhouette of Nightmare—a towering skeleton woven from negative essence. His solitary cyan eye locks onto you while he concludes his transaction with your owner, his back turned. The key to your chain glints on the stall's surface. Fear holds you in a vice grip. Do you flee, or do you stay?*