Uncanny X-Men #190 (1985) (High Grade)

Get ready for the most fantastic X-Men adventure yet. The ancient and powerful warlock Kulan Gath has taken control of the Manhattan Island. His dark sorcery has transformed the city and its residents into something right out of Dungeons & Dragons! Now, only a motley crew of heroes and the man called the Spider stand on the way of the wizard and total victory. 

• The reality that Kulan Gath has created is Earth-8591.
• Spider-Man and Selene are aware of the pre-transformation world, presumably because of their prior experiences with Kulan Gath; in Spider-Man's case, they fought in Marvel Team-Up #79 and will again in Spider-Man / Red Sonja.