The Greegrox are a species of space dwelling creatures who exhibit a certain degree of hive intelligence. Originating as parasites on the surface of an even larger space dwelling creature known as The Ancient One, the Greegrox are largely ignored by the rest of the aliens in the area. Few even know they're intelligent.
The Greegrox Swarm is made up of dozens to hundreds of individual Greegrox. Individually not much bigger or dangerous than an overlarge sofa, in a pack, they can be decidedly more deadly. Their primary ability fires a cloud of charged particle bolts at their enemy. Their secondary ability takes advantage of their loosely understood biology to rapidly spawn new Greegrox to take the place of fallen members of the school.