In the pre-retcon timeline when we were just meeting god tier Aradia with blind Sollux on Vriska's ghost ship, Vriska said that Aradia's powers would become useful once they found the "treasure". Sorry if my memory is bad but what exactly was that treasure and what would Aradia have had to do with it?

The treasure is Caliborn’s juju, the white intangible house. Aradia has telekinesis so Vriska brought her along so she could move the juju.