Hellbringers

The "Hellbringers" are specialized Marines equipped with flame weaponry.

History
Hellbringers are equipped with NA4 Flamethrowers, carrying a potent chemical mix with them in a tank that is spewed through a gun onto the target. A variety of mixtures have been created for work in various atmospheric and gravitational conditions, but they all work similarly to fry just about anything.

Hellbringers aren't particually common in the UNSC's arsenal, as they are usually only called in to exterminate the most firmly entrenched enemies, which means that they also take plenty of casualties themselves.

Halo Wars
Hellbringers appear as buildable units in Halo Wars, operating in squads of two. They are best suited for an anti-infantry role. They also carry flash bang grenades.