The Cravers are one of the playable factions in Endless Space. Part machine, part-insect, their hive has only one goal: to consume.
The Cravers were created by the Virtual Endless to use as a weapon against the Concrete Endless. They would swarm the enemy and use any available resources to feed the hive, replenishing their numbers and strength.
Before long, the Virtuals realized the threat this new race posed to the galaxy, so they marooned them onto an isolated planet and then bombed the surface in an attempt to eliminate them.
However, the war with the Concrete eliminated the Virtuals before the Virtuals were able to eliminate the Cravers. The insectoid race rebuilt its "civilization" and eventually learned to become a space faring race. The hive, at long last, could begin truly feeding.