There are 5 different treasure chests which are obtainable and 3 types of keys to open each one.
each treasure box has an assigned level to help determine how good each one is. You do NOT require these levels to open the treasure chests.
Common Treasure Chest (Lvl 60).
Rusty Treasure Chest (Lvl 121).
Old Treasure Chest (Lvl 151).
Rare Treasure Chest (Lvl 251).
Ancient Treasure Chest (Lvl 300).Each chest Require a key to open, and every chest has 3 possible corresponding keys Bronze, Silver and Gold.
Treasure chests and Bronze Keys will drop from all monsters, Silver Keys can be gained from giants, Gold keys are obtained from collecting or Item Mall.
You can also gamble by attempting to upgrade your keys at Master Slots NPC.
The type of key you use on the chest will also increase the chance of the chest to contain a rare item:
*Rare item chance with silver keys - x2 chance in comparison to Bronze key
*Rare item chance with gold keys - x4 chance in comparison to Bronze key