short lockout timer; heroic version also available
- A fairly large instance consisting of several passages and caverns, with many encounters of level 35-39, and tough bosses as high as level 40.
- There are three different "themes" of monsters, chosen randomly each time you enter: undead, beasts, or gargoyles. All three themes drop the same loot.
- Bosses are semi-common; roughly 1 in 3 chance for each boss. Each boss can spawn in several locations. It is possible to see two of the same boss in the same instance.
- Each time you want to enter this zone, you must first pick up the quest Investigating the Underrot Caves (Alone) from either Cryptomancer Nasrara or Investigator Dahno at the explorer camps at Timber Falls in Nektulos Forest (420,-1480). Entering the instance closes the quest.
- The entrance is located downstream from Timber Falls on the east side of the river. (349.86, 3.69, -1274.87)