The most rare loot can be obtained from Surprise Cube are the Pit Demons.
There is a chance of obtaining Surprise Cubes from Lorenzo after exchanging Arena Badges for potions. The higher the amount of required badges for a certain kind of potions, the higher the chance of getting a surprise cube.
The most expensive and rare items from surprise cube are Pit Demons :
You can see statistics here: link
The most rare is Red Pit Demon and Black Pit Demon, the others Pit demons are more easy to get!
The price of each one is between 15-25kk.
Good luck opening boxes :D
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