This unit is very fast and very efficient against high numbered armies or well protected elite units (especially Terran Tanks.)The unit has 4 abilities.The first one is the parasite ability which makes the enemy unit a spy.But
it will not convert into the Swarm just basically your sight improves by adding new eyes which are belong to the parasited unit.The second ability is the ensare ability which can be imagined like a high amount of mucus(disgusting!) which slows down the enemy and also shows the invisible units.The third ability is harmful only to Terrans.This ability gives a infestation chance to any damaged Terran Command center by just bringing the Queen near it.(no mana consumption).After infestation you can easily produce suicider infested marines which can be very harmful against heavy ground units or light outnumbered units (by splash damage).