Incubus Brood

The Incubus Brood excelled at the arts of scouting and reconnaissance. Lacking the destructive capabilities of most of the larger Zerg Broods, the Incubus Brood was directed to the Fringe Worlds and other small Terran settlements. The Brood would usually implant itself behind enemy lines, striking at infrastructure until the enemy collapsed in on itself. Due to its specialised nature, the Brood made extensive use of Queens and Defilers. Direct confrontation was mostly seen as a last resort.

The Brood launched an invasion of the Brontes System but was stymied by the efforts of the Protoss. Auza was thus forced to turn to a Terran rebel group under the leadership of Atticus Carpenter; a Terran Ghost. However, Auza's mind was unwittingly destroyed by Carpenter, who was then able to assume full control over the Brood for his own ends. Ultimately, the Incubus Brood was culled by the Overmind to prevent Carpenter from accumulating too much power within the Swarm.

Trivia
The Incubus Brood is named after Incubus; a demon in male form supposed to lie upon sleepers, especially women, in order to have sexual intercourse with them, thus spawning new incubi.