Idle Big Devil is a free idle RPG game with 3D graphics. Humans, Demons, Elves, and Undead coexist peacefully on the same continent until the balance was broken. A fallen prince of the human kingdom accepted the contract with Undead, and the evil spirits arose from the hell to cloud the minds of most creatures.
In such a critical situation, you are named by the King as a new lord with the duty to gather new heroes to fight against the darkness. One of the elders secretly tells you that the energy of heroes can be combined. 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 lords.
