Tass is the concrete, physical expression of Quintessence. These bits of pure Prime can often be used to fuel a mage's magical undertakings. If one is accustomed to thinking of the raw Quintessence as a pool, then think of Tass as Quintessence temporarily frozen like ice, floating on the surface of this larger sea. In time, this Tass will "melt," eventually flowing back into the infinite pool of Quintessence that first spawned it. Until it does however, Tass may be used by mages to lend power to their magic and to fuel their mystical Talismans. Tass can also generated in certain periapts.