Antrax was an artificial intelligence created in the Old World to protect the science of the Old World. It survived the Great Wars, but remained unknown to the Four Lands until it used the thought-dead Kael Elessedil as bait to bring humans with magic so it could steal their energy, since its power cells were failing. It had already done so with Kael, imprisoning him in his own mind, creating images so Kael would use the Blue Elfstones to fight back. Antrax would then absorb the energy. When it could get no more from Kael, it used him to set its trap.