The hero born in the wrong era

A man was standing on top of the walls of Goliath Fortress while holding a staff. From there, he felt like the greatest man in the world, the most powerful, the god that could end everything with just a snap of fingers. 

He was used to being called powerful by a lot of people out there back in his prime. He was used to getting acknowledged by each person that he ever fought. His will was unshakable, his sword unstoppable, his body unbeatable, and his magic overwhelming. Nobody could match his almost infinite power. 

'However, even for a man like me, there is something that nobody can ever truly defeat... It is called time,' he thought. For some reason, he liked that phrase. He always told himself the same thing every time he thought about his prime.