Jupiter Orb:
cost: 15 silver vouchers.

content: 11 Aurum Strongboxes.
Center strongbox is always the mimic.
To exit, you must kill the mimic, after which the exit strongbox will appear.

This gives people a different version where luck is removed, and it's about the party actually beating the mimic instead. It's guaranteed drops though, so cost must be increased from the other Trove battles.