The Ethereum crystal

The Ethereum Crystal is said to be the most powerful artifact and one of the most prized treasures of the Hodl Lands. The crystal itself was created by a Mage named Vitalis Buterium. Vitalis, inspired by Sashimi Macchiato, created the crystal as a continuation of Sashimi's work. It serves as a transmitter to the decentralized system of knowledge and memories of any being connected to it.
During the war, Vitalis was able to transfer the souls of Sealopolis into the crystal in the wake of a series of mass killings ordered by King Tusk. The crystal is hidden somewhere deep in the Northern Mountains far from the control of the Empire. Legend has it that the crystal is guarded by the five Ancient Masters and Vitalis himself.