Bio-feedback weapon are a weapon developed by the Herilian. Herilians developed bio-feedback weapon that turns to a human host that have been physiologically altered by Goa'uld blending. Diancecht has convinced scientists that this weapon will only affect Goa'uld, without affecting the host, but in truth, a Goa'uld simply ignore the bad effects the weapon has on its host body's senses. A blend Tok'ra, who freely share their host, were devastated, perhaps disabled. (RPG: "The Herilian Agenda")