Eight Gates Released Formation

The user opens all of the Eight Gates simultaneously, temporarily gaining powers a hundred times greater than their normal self, but will die because of the damage done to their body. This is seen when Might Guy opens all eight gates and fights on par with and gradually overwhelms Madara Uchiha — the Ten-Tails' jinchūriki — causing Madara to compare his fight with Guy to his fight with with Hashirama Senju at the Valley of the End.

Trivia

 * Might Guy survived the after-effects of opening all Eight Gates thanks to Naruto Uzumaki's Six Paths Yang Power. However, the damage done to his leg as a result of using Night Guy ended his career as a shinobi.