I would like to suggest A Master Key that can open any chest Except Artifact Chest and its have the same effect as opening chest with 
- A very low chance drop (0.1% chance) in any Extreme Quest
- Extreme Mini-Boss also have a low chance dropping them (0.5% chance)
- If possible, we can also fuse it with insanely hard to get items/materials
If this is possible to add into the game, that would be great!

