Levi's Medical Records from Another World

I died of cancer and was reincarnated into a different world where life and death are determined by card duels. But the path I chose is still to become a doctor. He saved lives and healed the wounded, but awakened the most terrifying identity - [The Dominator], an existence that can forcibly deprive others of their freedom. I am incognito, guarding a group of fugitives on the edge. I have never used the power of the Dominator. One thing must be the other, until...