Sentinels of Xeti

West of the Spine of Sotek Mountains, upon an acrid coastal plain beyond the Chasm of Condor, is to be found one of the strangest places in Lustria. The Sentinels of Xeti take the form of row upon row of monoliths, each dozens of yards high and covered in intricately graven patterns and shimmering green inlays. It is said that the Sentinels were erected at the order of the Mage-Priest Lord Arexibo of Itza soon after the Great Catastrophe. Their purpose is to listen for messages from the Old Ones, though to date none have been heard.

Source
pg. 34
 * Warhammer Armies: Lizardmen (7th Edition)