Yūkan'na Kettō

Yūkan'na Kettō is the matriarch of the Ketto family. Though little is known about her early life, it is recorded that she made her way from Asahi to Drayth, and soon found herself under the service of Hossim the Cruel's army. Little is known currently of what her qualifications were that got her in Hosim's service, nor what her position was in the service of Hosim.
The next solidly known thing about Yūkan'na is her betrayal of Hosim, trapping him into the state he currently resides in to this day.
Yūkan'na's betrayal of Hossim came as she was a member of the Fiend's End, an adventuring party dedicated to stopping the Fiendlords.