A new Valerian Vault system has been added to the game under the Wallet menu option. Store your unused HYPER in the vault for a period of time to gain interest.
There is a minimum vault deposit and the vaults have to mature for 30.42 days before it can be collected. Once a vault matures you can collect 4% interest on the amount vaulted. There is a 1% fee which is split between the game balance and the faucet balance upon opening a vault.