Lair
From HammerWiki
A lair is a type of secret area in the Warhammer Online world. It could possibly be a cave, a dungeon, a mountaintop; somewhere in the zone that is far off the beaten path, and generally disregarded. What makes lairs special, is that there are no quests or directions leading you there, so they are stumbled upon by explorers who enjoy seeing every nook and cranny of the world. By the number of blank Tome of Knowledge entries available to us which regard lairs, we can assume there is one hidden lair in every zone.
