The journal will update, telling you that a new hidden lair was discovered. Head up the path leading to the Sundermount Passage. Keep going until you reach the ruins where the second scroll is located. There should be an encounter with an Arcane Horror.
After killing the Arcane Horror, your journal will update stating that you have completed the quest.
Damage: 38 cold damage
(62 per second)
+16% cold damage
5% chance to regenerate 4% health, a 2-handed axe dropped by the Arcane Horror.
- The 2 scrolls located at Sundermount may not trigger properly if you miss the first one at the bottom of the mountain before camp.
- If the last scroll that you obtain is the one at the bottom of the mountain before the camp, then you will have to travel back up the mountain to where the other scroll is, where you will face several Shades. Upon defeating those the entrance at Anders' Clinic will trigger.