You may assign this small robot to a creature within touching distance. It will activate and follow this creature.   The first time the creature would drop to 0 hit points as the result of taking damage, the creature instead drops to 1 hit point and the guardian angel robot runs out of power, dropping to the ground and instantly detonating (a very tiny detonation).   If the creature is instead subjected to an effect that would kill it instantaneously without dealing any damage, the effect will instead be negated and the guardian angel robot will run out of power, similarly dropping and detonating.   Only one guardian angel bot may be deployed at one time.