Mage/Priest Wars

From The Heretic Knowledge Vault

Specific details are unknown, except that the Mage/Priest wars were fought between Tsuiraku and Veracia. They began when Shiro Hideaki, a mage from Tsuiraku, attacked and attempted to siphon the power from Luminosita, the Veracian god-construct. The whole process, aimed at ressurecting Shiro's dead wife, ended in his death.

The full outcome of the war isn't clear, but since Tsuiraku was able to invade and steal several books from the Vault of Heretical Knowledge they were most likely victorious.

Mentioned here.