Quartermasters

Factions introduced a new type of NPC: the Quartermaster. These traders are similar to the trophy item Collectors in Nightfall: they accept items you receive as quest rewards and trade them for useful equipment.

A Quartermaster NPC in Factions can be identified by the word [Quartermaster] after its name.
Early in the game, characters can earn Monastery Credits by completing low-level quests. You can take them to a Monastery Quartermaster in Shing Jea Monastery or Seitung Harbor.
Later in the game, characters can earn Imperial Commendations for completing higher-level quests. You can take them to an Imperial Quartermaster in Kaineng Center.
In Cavalon, a Luxon Quartermaster collects Luxon Totems.
In House zu Heltzer, a Kurzick Quartermaster collects Equipment Requisitions.


Event Rewards

Some special events include opportunities to acquire exotic quest items, which you can then trade to a Quartermaster, Collector, or similar NPC in exchange for a reward only available at that event. http://www.guildwars.com/gameplay/gwnfeatures/collectors.php