I Own a Tomb of Evil Dragons

After two deaths, Sherrell, who had transmigrated to world of sword and magic, inherited a tomb of the evil dragon.
As the administrator of the cemetery, he got the ability to summon evil dragons and became the representative of the evil dragon in the world.
In the magic world where strength was the most important, the evil dragons began to come back to life by trading lives and devouring souls.
Shush! Did you hear that wild roar? That was the return of the dragon. They would make the world tremble again!