Ouiwu
From The Thalassan Sphere
The Ouiwu were an order of demon fighters founded by Aymar Summerborn and led by Yrol I. More than 300 years passed between their founding and the Chaosborn War. They fought against Thoth Chaosborn, but were broken by his armies of the undead.
After the war, they were replaced by the Ordopranni.