Omega Zero – Mega Man Zero/ZX Legacy Collection
Discovered in Mega Man ZX, Omega Zero is easily one of the hardest bosses in the entire series. Along with possessing a number of Zero’s classic abilities, Omega Zero moves incredibly quick and has three – yes, three – health bars. Playing on Hard Mode? Good luck avoiding his saber slash combos which can either heavily damage or instantly kill you. He’ll also heal during the fight, making this even more of an endurance test. But if you beat him, then you’re on the path to unlocking the most powerful Biometal in the game – Model O(x).