Durability

There was a crimson flash as the xenos warsuit jumped, jet pack flaring, and twisted in mid-air. Its rifle dipped to send lozenges of plasma stabbing at Numitor. He swayed left, taking his own return shot as the killing energies zipped past him. The sergeant's aim was true, and his bolt shell rocketed under the warsuit's hemispherical force shield. It detonated hard, throwing the xenos off balance for a moment. The warsuit fought to stay atop the transit cylinder. Its crackling blade curved down, a wild swing that missed Numitor by a hand's breadth but carved a diagonal furrow through the roof.
Suddenly Sicarius was there, bursting through the hole his plasma pistol had burned in the transit cylinder roof to swing his Talassarian blade hard at the warsuit's waist. The xenos raised the humming disc shield on its arm, and the sergeant's broadsword was deflected in a cascade of blinding light.
Numitor took his chance, a short push from his jump pack hurling him upwards under the tau's guard. His power fist connected hard with the warsuit's shoulder, its disruption field flaring on impact. The uppercut had enough force to tear open a tank. The arm projecting the warsuit's energy blade was ripped free in a shower of sparks as the xenos warrior was flung backwards hard, electric blue flame gouting from the ruin of its shoulder. It soared sidelong from the transmotive, jet pack blazing intermittently, but the disruptive energies of Numitor's blow still danced across its torso, and it could not correct its flight.
Arcing down, the warsuit hit the water of the reservoir below like a boulder flung from a catapult.

Blade of Damocles