The Destroyer of Worlds

After his country was attacked by a rival race, Dexter was reincarnated as a lesser demon. Thankfully, he inherited a dungeon from the demon. Knowing that he didn't have the strength to fight against the monster in the dungeon, suddenly a strange crest appeared on his palm after hunting down the weakest creature. [Welcome Hosts] [You have unlocked the Demon Lord System!] "What happened to me and what was that sound?" Dexter's adventure begins with the inheritance of the dungeon and the power of the Lord of the Sun. Can he fight the other Demon Lords who find out that the strongest Demon Lord has inherited his powers to a teenage demon?