34 years of war, billions of soldiers and civilians dead, all colonies on different planets under attack. And it is up to you to save them, as an commander of one of the Frigate Class ships named "Wings of a Angel" that came from an mission far in space to find new planets to life on, got the task to destroy the Covenant invasion of destroying humanity.
The Mantis is a powered exoskeleton armor defense system similar to the Cyclops. However, where as the Cyclops was designed only for labor and modified to function in combat, the Mantis was created specifically for combat purposes as an evolution of an earlier model. To that end it is equipped with several weapon and defense systems: including armor plating, energy shielding, and two weapon pods on either side of the cockpit.