Hunter Killers are essentially double-powered hydralisks, doing double damage and enjoying double the hit points, as well as having both hydralisk upgrades by default. They are usually tinted red in campaign missions. Unlike the Devouring One and other specialized units, the Hunter Killer received a custom portrait. They cannot be produced.
Hunter Killers also appear in a few scenario maps, specifically in StarCraft Fortress,[1] as reinforcements in Bunker Command II[3] and appear in Twilight Struggle. The yellow brood defends each cerebrate with four of them.[4] Hunter Killers are also found on the map Bazaar, and are sold by Crazy Bob's Bazaar. They are slightly less resilient than their Swarm counterparts, but are otherwise just as deadly.[2]