Welcome to the Realms of Ether. A rediscovered NFT-based computer game that launched on the Ethereum blockchain on December 30 2017.
Realms of Ether Fortresses can be staked in the Gold Mine at https://realmsofether.com/. Those staked castles will appear in the contract at 0x4F9dEcDF87428AED7C1dAdE33B5f31f58BA0e3DA. This makes owner metrics incorrect.