Dark Sun: The Karsto Campaigns
Iax Cavaka is a primordial who is said to be as old as Athas itself.
The party first learned of Iax Cavaka upon being imprisoned in Uriah’s Keep for their involvement in the Veiled Alliance. Uriah, a high priest of Iax Cavaka, spoke of his god as an ancient and powerful entity that dwells within the earth itself. It’s supposed that Uriah draws his power from the primordial.
On Ledo, the giant earth elemental priests revere Iax Cajaka. It isn’t known whether or not the variation in name is local dialect, but Uriah spoke of the giants of Ledo as worshipping a false and twisted version of Iax Cavaka.