Originally, the Mantis Screamers were born with a stinger of considerable size on their tails, but, at an uncertain point in history, Glave parasitesnatives of a dead planet in the Dinares sectorinfested a rather large clutch of Screamer eggs. The Glaves consumed the embryos stingers and took their place, modifying the Screamers tail accordingly. After being assimilated by the Swarm, the Glave was slightly altered, and it now spawns and launches destructive, semi-sentient Wurms with great force.