From Halopedia, the Halo wiki
The Warchief is a variant of the Marauder. It is equipped with 2 additional flags.
The Marauder Warchief is a unit available for play in the Blitz and Blitz Firefight modes of Halo Wars 2. It is available for players playing as Decimus. The Marauder Warchief Blitz card has the following attributes;
The Warchief is classed as a core vehicle that performs well against air, infantry, and vehicles.
List of appearances