From Warhammer 40k - Lexicanum
Serena Erizon is a former Ordo Xenos Acolyte, who converted to the Tau's cause after being exposed to the Greater Good in the Jericho Reach. She has used the Tau’s poor understanding of her psyker abilities to rise through the ranks of the converted and now holds sway on a world of the Velk'Han Sept.
- 1: Deathwatch: Game Master's Kit, pg. 26