Slayer is: -Rand's Uncle, Luc -Luc is Tigraines Brother -Lan's Cousin, Isam -Isam is self explanatory. -Slayer has been along for a long time since he was created after Luc Andor. -In the Blight he must have gone to Shayol Ghul and been taken over by Isam's soul, or something like that. -Anyway, Slayer was created, Luc in the flesh world, and Isam in the World of Dreams. A reference to Slayer, in book four mentions that Rand's true father was killed by a man in the blight, who he wouldn't attack because he "reminded him of Shaile" Shaile is really Tigraine, Rand's Mother. Tigraine's Brother isLuc. Now Later, after Slayer disappears, he is mentioned again. In Book 6, Egwene mentions seeing Rand, Perrin, and even Lan walking the dream. Rand walks the dream in the flesh, Perrin the wolf dream, and Isam bears a uncanny resemblance to Lan, as noted by Nynaeve, who was shocked that Lan would shoot at her. So Slayer has a long history, and he is not done yet.