Everything

Generally, the materialized energy known as Tass (in Technocratic terms, Currency) occurs naturally. A skillful mage, however, can use Prime 4 to create Tass from free-flowing Quintessential energy. In story terms, she draws that energy toward herself and then shapes it through her focus. A faith-using mage, for instance, could pray the energy into a bowl of holy water, while a Syndicate rep counts her money, “instilling value” into it as she runs her gaze and fingers across the bills.

Tass gets depleted as its energy gets used. That holy water, for example would evaporate when the Quintessence is gone. Those energized $100 bills would crumble or tear, becoming worthless as their “value” is spent. Once the energy has been sapped from Tass, the material form ceases to exist.