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"The Swarm Flock - a flying group of Swarm Leeches - will be your worst nightmare."
—Official Gears 5 statement.
A Leech is a type of creature found within the Swarm. They are capable of flight and hunt in packs. They also have the ability to subvert COG technology such as the DeeBees, creating Rejects, Stumps, and Bastions. When it comes to humans, a single Leech will either explode on contact or burrow into the chest of a human and expel right back out, killing the host. When hunting in packs, the Leeches are called a Flock.