A planet-load of potential psykers, chaos-immune psykers, no less, that can shoot death beams, feed an entire platoon off ambient energy, with the right spells could be immortal, and can augment their own, and their comrades' bodies, for super speed, strength, and perception, and they have a whole array of useful spells, like goddamn invisibility, at their disposal. The inquisition will have a major hard-on with this one.