There are 3 types of Combo-Cubes: Imp Combo-Cube, Demon Combo-Cube and Devil Combo-Cube. They can be obtained during Demons Invade Dartrong and Demons Invade O’Delvays events, by opening Gnome Runes, by participating in Luck Glow and other special events, they can also be purchased at the Rare Resources Fair or from other players.
Combo-Cubes can be used for example during the Trade Journey event, where you can exchange them for IOU. They can also be broken up into 4 regular cubes, which then can be used in battle (to absorb damage you receive) or for quests, such as the quest for Medal of Worship of Mercenaries.
In order to break up the Combo-Cube into regular cubes, you will need to bring the required resources to the Demonologists Berrush and I-Vidi.
The regular cubes can also be purchased at the Rare Resources Fair or obtained from various quests, such as:
- Demonologist Feud  (3 Cubes - the colour depends on the difficulty you choose)
- Balthazar  (3 Imp Cubes)
- Balthazar's Banishment  (8 Demon Cubes)
- Gizedor's Big Problem  (3-7 Devil Cubes)
- Uninvited Demonologist Guest  (4 Imp Cubes)