HPSI-4 Fenris

Proteus Group


Heavy Powered Armor

Technical specifications

2.6 meters


3 meters


6.2 meters

  • 15.2 tons (dry)
  • 16.1 tons (fully loaded)
Maximum speed

128 km/h running

Power plant

SCE-2P Miniaturized Protoculture-cell energizer (8 standard Protoculture canisters)

Sensor systems

TPG-183 X-band pulse-doppler phased array spherical radar

  • 1 x Random Hand-held weapon
  • 1 x Medium plasma pulse weapon

1 pilot


Civil Defense

Year introduced



Army of the Southern Cross

HPSI-4 Fenris was a powered armor suit that was used by the Cold Weather Offensive Squad of the Army of the Southern Cross.


Named for the savage and implacable Fenris from Nordic legend, the Fenris powered suit perfectly reflects the fighting doctrine of the Cold Weather Offensive Squad infantry. Built for speed and brute strength, the Fenris was specifically designed to operate in the bitter cold and high altitudes where the TCCD does most of its work. The mecha's feet are design for use in snow and on ice, with a wide footprint, retractable spikes and deployable supports to act as snow shoes. Along with jump packs, this makes the Fenris more than capable of navigating deep and soft snows, broken ground and sheer cliffs of ice, frozen lakes, and even shallow water.


The armor on the Fenris was a new development in low-mass composite-materials Chobham plating that became the standard for all Terran mecha. Aside from the respectable protection provided against projectiles, missiles, and other kinetic weapons, this armor was also resistant to plasma globes (annihilation discs), lasers, and to a lesser extent, particle guns, owing to the fact that the armor could flake off and evaporate in layers under fire from such high-energy weapons, taking much of the weapon's energy and converting it into the latent heat of sublimation in the armor. The armor stopped all small arms, heavy infantry weapons fire, and light mecha-mounted weaponry, provides fair to good resistance to medium mecha-mounted weaponry, such as the Valkyrie's 55mm APFSDS round, and provides poor resistance to heavy mecha-mounted weaponry, such as the VHT-2's 120mm shell.

The Fenris provided full protection from nuclear, biological, and chemical hazards, using a fully-sealed cockpit module activated by radiation and hazardous chemical sensors, or manually when biological warfare conditions are anticipated. The cockpit module was also armored and gives the Unicorn the option of operating off-planet on the moon or elsewhere in the system. The internal consumables supplies could provide atmosphere purification for one week maximum on Earth and 48 hours in a hostile environment such as the moon or Mars.


Most of the Fenris were destroyed valiantly defending their posts against the initial Invid onslaught.

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