From Halopedia, the Halo wiki
Halo Wars 2
Voridus is exclusive to himself and can be built at the War Council. Like other hero units the player is limited to one on the field at a time. Voridus performs well against infantry, but only okay against vehicles and structures, and cannot attack aircraft. Once the Infused Hammer upgrade is purchased Voridus will perform well against vehicles and structures. In Blitz he costs 230 energy and features the Shock ability to decrease enemy units' armor.