These are a buyable rewards with real money used to help support the server to get limited edition items and many other things as below.
Old version Is shown in Devblog 8, showing a person going to a chest and opening it
The items that are currently in the chest are pets, hats, titles, resources and other things. Currently unknown
as of 18th October the prices are
- 1 chest for $2.49 USD
- 5 chests for $10.49 USD
- 10 chests for $20 USD