From Halopedia, the Halo wiki
Enduring Locust are a specialised type of Locust employed by the Banished.
The Enduring Locust is a unit available for play in the Blitz and Blitz Firefight modes of Halo Wars 2. It is available to players playing as Colony. The Enduring Locust Blitz card has the following attributes;
The Enduring Locust are classed as Anti-Building, and performs well against buildings, but not great against infantry, vehicles and aircraft.
List of appearances