Idle Big Devil

Humans, Demons, Elves and Undead coexist peacefully on the same continent until the balance was broken: A fallen Idle Big Devil of the human kingdom accepted the contract with Undead, and evil spirits arose from the hell to cloud the minds of most Idle Big Devil creatures.

In such a critical situation, you are appointed by the Idle Big Devil as a new lord with the duty to gather new heroes to fight against the darkness.

One of the elders secretly tell you a secret that the energy of heroes can be combined with Idle Big Devil.

And the High Priest creates a device to duplicate heroes. All duplicates have no feelings or minds.

With all these, you are going to prepare yourself for monsters, fallen heroes, and other competitive Idle Big Devils.