The Castoffs #4 (Oni Press, 2017)

The apprentice mages are in way over their heads they re in the clutches of a cult leader and her hive-mind minions, in the middle of a desert and far from their guild. Can Charris's formidable weather magic, Trinh's curse-breaking, and Ursa's charmed tongue save the day? These girls will have to trust and rely on each other if they re going to take down the Priestess for good!