What is the source of power of wizards who harvest resources in different planes?

Rock was connected to the castle of the noble viscount. There are many children of his age here, all of whom are the illegitimate children or nephews of the viscount. The reason why the children were taken into the castle is unknown. Nobody cares about this except Rock. They are immersed in the joy of becoming aristocrats, and do not know what is waiting for them
Rock learned from the books he read that the nobility had the blood of a wizard, and became interested in it. He really saw the power of wizards in the family secret place. At that time, he did not know that it was used to awaken the power of wizards, until he learned from the viscount's father that he had the talent of wizards, which was the hope for the continuation of the family title. He learned that wizards were the support of the nobility, and that different levels determined the size of the nobility's title. Only then did he know that the return of illegitimate children was for someone to become a wizard, whether black or white.
Roark obtained the qualification to become a black witch through secret trials. He went to the college to use his collection ability to improve himself, walk between various planes, obtain stronger resources, receive the devil's favor, cultivate the power of rules, and walk out of a path dedicated to his wizard.

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