The Mind of Madness is a Side Quest in Sword Coast Legends. You can start this quest by completing Into the Dead City.
- Locate Maferil
- Defeat the shade of Maferil
- Take Maferil's portal
Eldinger and the other opens the door to a bunch of Zombies (one of which drops a part for a bow). That statue puzzle opens the door to Maferil. Defeat him and then speak with him. Be sure to loot the many high-powered scrolls before exiting. Use Search to find them all.