Goku: (grimly) I'll just have to try harder.
Cooler: By all means, try.
President: What're you saying, Calvin?
Swanwick: I'm saying it's unkillable.
In fact, he had been utterly defeated so often, Tahu Nuva had lost count. But each time, the Piraka got back up again, stronger than before. Worse, he never seemed to grow tired. If anything, he appeared to be more and more amused.
All six Toa, individually, had brought him down, only to find their attacks ineffective during his next attack. There was still the option of using their powers in combination, but if Reidak were to rise again after that and be immune to it... the thought wasn't a pleasant one."