Ha! I was right! At the very least, halfway right. Thinking more, I believe Ellyn is a Slayer. Why? The Wilders used to hunt psionic creatures, like Mind Flayers and...uh...Illithids. Ellyn, of course, is using the Wilders as puppets to further his scheme. Then, of course, good ol' Ellyn hears about this Crystal Consciousness, and then makes a move to kill the other Chosen so he can change the Disciplines. And where would Illithids be without Telepathy? He could cripple the MInd Flayer universe through such an action. And he can't let on he's a psion, else his Wilder cronies will attack him. A plausible theory, eh?