Players progress through the quest line by acquiring . Unlike most other forms of currency, these are used primarily for quest progression, though some items may be purchased to gain reputation with the faction city capitals, or even to buy a chance for the to drop. These are all offered by Zen'Vorka. It should be noted that players may not even begin the quests unless they have completed all the quests in Mount Hyjal, up to and including Aessina's Miracle. For that reason, Guardians of Hyjal: Call of the Ancients is offered to those who have not progressed as far as they need.