Boss Lock

Boss Locks controls Gates that block further progress in dungeons. They need to be unlocked with a Boss Key, acquired by killing a guardian boss.

Locations

 * Depths of Tyria
 * Bogroot Growths (level 2)
 * Catacombs of Kathandrax (level 3)
 * Cathedral of Flames (level 3)
 * Darkrime Delves (levels 1 and 2)
 * Ooze Pit
 * Rragar's Menagerie (levels 2 and 3)
 * Secret Lair of the Snowmen
 * Vloxen Excavations (levels 1 and 3)