The X-Men (vol 1) #160 VF

While the X-Men go through a training exercise on their island headquarters, the evil sorcerer Belasco lures Colossus' little sister Illyana away from the X-Men's side. Sprite notices that Illyana is taking off, follows her into a temple and steps on a light circle that teleports her away. Noticing that both girls are gone, the X-Men follow their trail to the temple, where they too are teleported away by the light discs. All of them are taken to an other-dimensional Limbo, but they arrive in different locations. When Kitty awakes, she is approached by Nightcrawler, who starts touching her lewdly and Kitty realizes that this is not the Nightcrawler she knows. She flees right into the arms of Belasco, who imprisons her in a magical crystal and separates her skeleton from the rest of her...