Path to omnipotence

What would you do if you wake up someday and find that the world that you know has already ended and new dark era is on the verge of begining?

What would you do if you find that your personality and character is suddenly not the same anymore ?

This is a story about a man that transformed completly from a kind and cowardly person to a powerful , cold and cruel lone survivor who will leave an indelible mark in the obscure times.