Their health will automatically regenerate if they are 'killed'. In campaign, hero units can be revived if they are 'killed', once their health has regenerated to half its maximum value. The exception is the UNSC leaders in Halo Wars, who get unique leader powers and 3 SPARTAN-II supersoldiers from the Barracks. In multiplayer, most leaders have their own unique hero unit, which can be purchased at an Armory (UNSC) in Halo Wars 2, Temple (Covenant) or War Council (Banished). They appear in both campaign and multiplayer, but are limited to one per player in the latter.

Hero units are strong units that have a large amount of health and usually a powerful weapon.

In addition, all upgrades are 50% cheaper and require 25% less research time, apart from Cryo Bomb and Hawks which are 25% cheaper and require 25% less research time.

In addition, all UNSC Supply Pads start out as Heavy Supply pads, saving the 100 resources used to build normal supply pads.

Also, all bases receive free upgrades newly built bases are Stations, not Firebases, and the initial home base which would usually be a Station is a Fortress.

Halo wars 2 unique units