It can't be you

Ren looked at the six spirit rulers and showed his vicious smile. He was getting really excited, he has never seen any of the spirit rulers, but he has heard tales of them. Unfortunately back in his peak, no one was able to summon them. If Nezzard was living back in his past life, he would most probably become a human hero, if not he would still be a hidden master that would have challenged him. 

It was exciting to see the increase in Nezzard's mana, even counting all the humans he fought in his past life, Ren was sure that Nezzard has the greatest amount of mana he has seen a human hold. Still, having stronger mana doesn't necessarily mean you will win. Mana was just fuel if you don't know how to use it properly, then it's worthless. 

Ren then looked at each of the spirit rulers, each one of them was the peak of one element. The mere thought of fighting such beings made Ren tremble in excitement. 

...