Originally posted by Board Walkerhe's nowhere near immune to kryptonite. If you didn't notice after he tried that stunt all of his powers were sapped for the duration of his fight between him and Lex.
Superman just needs to fly up to Nightwin and kill him in one punch, he may have kryptonite armor but its not going to protect him from a solar system moving punch.By the way, Supes is near immune to K-nite, or have you not seen when he fought against Lex on a ship made of K-nite, and won.