Comparing the old school zerg arial unit, the devastating suicidal unit "Scourge". Do you remember how this airial unit destroy a pack of carrier's hovering you main base hives and nest, swarming your overlords and drones. the Scourge is one of the most important backup unit for destruction and devastation tactics. The only cons for this unit is, it only for air.
Looking to the future sight of starcraft 2 units, Scourge once powerful unit is not been replace with creepy rolling unlikely creature baneling. This baneling is an acid containing suicidal unit of zergs. Baneling is an extremely highly dangerous acid creature that cannot barely walk but rolls only for movement. The Baneling has one mission in life, if Baneling sense a presense of unknown it just explode itself and inflict a huge amount of acid damage to specific range of target.
Baneling are so called "living bombs" or "bomb tracks", they can easily ripe off a dozen of infantry with just one delivery. Stories said that Baneling was created for its sole mission in life, to destroy everything. As of the moment, High level Terran Commanders have no idea on how to counter attack this kind of ultimate suicidal creature.
