Xei'sha

The Xei'sha (Die for Death's armor or system) was an experimental battle armor developed by Kalus for the Omnusali that uses ripped souls to power. Its power and capabilities were dependent on the soul's original host, though the armor could be controlled en masse.
In order to function, a shell in the armor was used to drain a soul from the user, harnessing it into the armor itself. However, those with a strong sense of will can reject the transfer.