Roach Evolution: Corpser and Vile (Starcraft 2: Heart of the Swarm)
The corpser strain was developed on Cantar, a hidden protoss world, from a strain of scantipede which housed a virulent parasite. The vile strain was developed on the protoss-occupied world of Mehlus IV from roaches which were forced to drink microbe-infested water. The survivors became the vile roaches..."Roach Evolution" mission from 'Starcraft 2: Heart of the Swarm' PC game... Gameplay on Normal... ► Watch more Starcraft videos: http://bit.ly/1b1W2yY.
Roach evolution:
* Corpser strain: Units attacked by roach will spawn roachlings if killed.
*Vile strain: Roach attacks slow enemy movement and attack speed substantially.
Wiki:
The roach is a particularly tough, armored breed which possesses a high-speed regeneration ability when burrowed. A roach is just slightly shorter than a terran wearing CMC armor.
Roaches evolved from the fast-healing zantar slug of Garxxax and were in use by 2501, taking part in a battle on Shi. Their ranged acid saliva attack is capable of penetrating neosteel and armor, and violently dissolving flesh on multiple entry points. This saliva is derived from the zantar slug and is expelled with considerable force through the muscles that surround the roach's salivary glands—highly specialized striated ducts that produce a unique enzyme that weaponizes the creature's already corrosive saliva.
If pressed into close quarters, roaches use scythe-like blades on their backs to dispatch the enemy. The hardness of these scythes allows roaches to scythe through neosteel and armor with ease.
The roach's metabolism is ten times greater than that of the zantar slug (increased through assimilation), and gained the ability to quickly regenerate even the most grievious wounds when burrowed. The absorbtion of soil compounds, especially rare earths and metals, has allowed roaches to develop extremely thick carapaces. Some Dominion scientists have theorized that the roach is not immune to the ravages of its acidic body fluids, and the creature's potent regeneration capabilities ensure tissue integrity in spite of constant corrosion.
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