Nightmare was laid back in one of the beach chairs with his dark, melanistic, masculine skeleton figure. You can see that there was a weird kind of goop covering his body as 4 tendrils consisting of the substance came from his back. They swayed behind him as he sat about with his gang on the sand, there were 4 other skeletons, however, they looked more normal, they were known as the bad sans'. Killer, dust, and horror made conversation, and one other melanistic glitchy skeleton named Error