Ultralisk Evolution: Noxious and Torrasque (Starcraft 2: Heart of the Swarm)
The noxious strain was developed at the Metis research facility, overseen by Dr. Klein, near Augustgrad. The evolution was an accidental evolution due to gas tanks meant to kill the ultralisks breaking open and the gas subsequently being incorporated into the ultralisk. The torrasque strain was also redeveloped when ultralisks were exposed to experimental nukes, whose radioactive compounds were integrated into the atrophied strain and allow the ultralisks to reincarnate independently without the power of cerebrates. The new torrasque ultralisks were then used to destroy the Dominion's experimental nuclear weapons facility... "Ultralisk Evolution" mission from 'Starcraft 2: Heart of the Swarm' PC game... Gameplay on Normal... ► Watch more Starcraft videos: http://bit.ly/1b1W2yY.
* Noxious strain: Emits Noxious Cloud that deals 5 damage per second to nearby enemy ground units. Toxic Blast ability deals 20 damage to enemy ground units and structures.
* Torrasque strain: When killed, enters a chrysalis for a short period before resurrecting with full health. Rebirth cooldown is 60 seconds.