Hellbringers

The "Hellbringers" are specialized UNSC Marines equipped with the NA4 Flamethrower.

History
flamethrower are equipped with NA4 Flamethrowers, carrying a potent chemical mix 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 particularly common in the UNSC's arsenal, as they are usually only called in to deal with the most firmly entrenched enemies, like the Flood, which means that they also take plenty of casualties themselves. Also they might be poor against vehicles, especially tanks, but they are good against basic infantry. Similar to the M7057/Defoliant Projector's role in Halo 3, the Hellbringers are very effective against the Flood, but require assistance from vehicles to prevent infection, since the incoming Flood forces will probably be large in number.

They appear as trainable units in Halo Wars, operating in squads of two. They are best suited for an anti-infantry role and they have up to three upgradements :
 * 1) "Flash Bang": flamethrower stun enemies with Flashbang Grenades.
 * 2) "Napalm Adherent": Allows flame to continue to burn after initial attack, causing continuous damage.
 * 3) "Oxide Tank": Gives the flamethrower a higher temperature flame to increase damage to organic targets.

Trivia

 * The helmet the Hellbringers wear bears a slight resemblance to the EVA helmet.
 * They are very similar to the Black Hand infantry from Command and Conquer 3, heavily armored soldiers with flamethrowers.
 * Like Helljumpers, they may be more than just specialized units; they may hold a reputation among typical Marine units as well. This can be inferred from their atypical name, and the fact that it's been said that "it takes a certain kind of lunatic to use a flamethrower" by Marines before.