章 160: Richard's Past (4)

"Hahaha, don't blame this old man for getting excited. Now, let me explain to you everything slowly," said Dumbledoor as he struggled to keep in his joyful laughter.

"Let's start with the basics. As you might know, we can class the roots into four categories, low-grade, medium-grade, advanced-grade and peak-grade. They also have levels among them between the grades, but that's not important. There is actually another grade known as the perfect grade. Those are roots that have complete assimilation with their particular elements. They have no bounds on how strong they can get and those who possess said roots are called Sovereigns," Dumbledoor explained calmly.