An unnamed giant khaydarin crystal was found at the heart of the Aiur chambers by protoss explorers. A xel'naga-crafted artificial intelligence, its directives were unknown. The protoss mystic Khas believed it was designed to teach. The crystal generated a powerful "heartbeat" sound in the chambers during the Aeon of Strife. It pulsated as it moved languidly and its facets were in a perfect ratio. The preserver Zamara believed it was made of very pure khaydarin crystal.