Mystery boxes are found in either solo campaigns or multiplayer dungeons. The boxes unlock with one skeleton key and contain a random, rare item.
Possible Prizes:
- 5 Soul Crystal
- 1 level 70/80 Legendary Stones (depending on the level of the dungeon)
- 5,000 to 15,000 Gold (varies on dungeon level)
- 1 City Protection Token
- 3 Bound Balens (used to be 30, decreased after a maintenance)