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An Adrenal Gland is a Tyranid Biomorph that is commonly developed in the frontline creatures of a Tyranid swarm. Adrenal Glands massively increase the production of adrenaline within a Tyranid bio-form, and also saturate their host's bloodstream with other chemicals that boost the creature's metabolism to a hyperactive state of frenzy. This allows the organism to move more swiftly and attack with greater strength. The most common Tyranid bio-forms found with adrenal glands are Hive Tyrants, Tervigons, Tyranid Primes, Tyranid Warriors, Genestealers, Termagants, Hormagaunts, Rippers, Sky Slasher Rippers, Tyranid Shrikes, Gargoyles, Harpies, Carnifexes, Trygons, Mawlocs and Tyrannofexes.
- Codex: Tyranids (5th Edition), pp. 84, 86