Prospero's Lesser Vault
Named for the God of Wealth, Prospero's Lesser Vault is an artefact that doubles the rift capacity of its owner. It can be purchased from Merentesh, whose artefact shop is in Delos, as can its aptly-named cousin, Prospero's Greater Vault.
A large argent coffer, the Vault is slightly domed and decorated with swirled engravings punctuated by glittering sapphires. A door dominating the front of the safe is made of the same silver, and it bears a wheel-shaped, spinning handle that nearly spans the face of the vessel itself. Etched into the centre of the wheel is the Divine symbol of Prospero: a gleaming circlet.