Mind hunters (or "brîshalgwin", also referred to as "ciphers") are a type of Glanfathan magic caster used in combat, notably the War of Black Trees and Broken Stone War. They invented the discipline.
When relations between Eir Glanfath and the Dyrwood thawed, mind hunters told animancers how Glanfathans had developed mental abilities that allowed them to perceive and contact what animancers categorized as "housed" souls, i.e., souls held within a physical vessel. They initially developed these talents in an attempt to communicate with souls held in the Engwithan ruins they were sworn to protect. When the tribal princes outlawed this practice as disrespectful and dangerous, their councilors advised the princes to turn the efforts of the brîshalgwin towards protecting the ruins and developing new methods of warfare.