From Halopedia, the Halo wiki
Bloodfuel Locust are a specialised type of Locust employed by the Banished.
The Bloodfuel Locust is a variant of the Barukaza Workshop Locust employed by The Banished. It is equipped with a giant Siphon attachment that resembles the Bloodfuel rifle on top of the Focus Cannon.
The Bloodfuel Locust are classed as Anti-Building, and performs well against buildings, but not great against infantry, vehicles and aircraft.
List of appearances