You can change your reward at random into another one. The more often you re-roll, the higher your chance to get a better reward. You cannot change back after re-rolling, however, so choose wisely.
Function
Can be opened
Quests
This item is not used in quests.
Origin
Other: Victorious in Sung Ma Invasion after 4 participating days in a week
Other
Tradeable
Dropable
Storable
Stackable
NPC
Trade Window
Private Shop
Mailbox
No
No
No
No
No
No
⇒ This item cannot be found in Shop Search
Upon opening you have a choice to take the item displayed, or pay Yang to change the reward. The more times you change, the higher the cost, up to 15 times. In fact, the cost doubles each time you want to change the reward.