Primary quest

List of quests by campaign/expansion
 * Core
 * Prophecies
 * Factions
 * Nightfall
 * Eye of the North

Primary quests, along with missions, are designed to advance the storyline of a particular campaign to the next step. In most cases, completing primary quests is the only way to progress the game since they unlock certain outposts and missions upon completion.

Primary quests are listed under their own heading in the Quest Log so it is easy to identify which are required for storyline progression.