Hellfire

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Hellfire MkI
Basically a mobile Hellfire Missile turret, the Hellfire Drone provides artillery cover, destroying packs of enemies indiscriminately with a constant swarm of missiles.

Hellfire MkII
Increasing payload size sounds simple, but requires the standard MkII Drone miniaturized power core along with some tricky engineering.

Hellfire MkIII
A large, cumbersome drone, the MkIII Hellfire can bombard enemies from afar and is the most effective artillery drone available.