Aura of the Omnissiah: The Machine God tends its own. While a Tech-Priest stands on the battlefield, every friendly Construct within 6" of that priest is wrapped in the machine-spirit's blessing. Whenever such a Construct suffers a Wound, it may make a 6+ shrug — a single save against that Wound, taken regardless of the attacker's Armour Penetration, though weapons that already deny this save still deny it.
This is not resurrection but maintenance made passive: the well-tended engine that keeps grinding simply because a priest is near. The aura asks nothing of the priest's activation — it radiates for as long as the priest lives. Cut the priests down and the blessing lifts, and the machines fight on with only their own hulls to protect them.