Cleansed Essence of Insanity
Use the Lectern of Enchantment in Sanctuary to infuse Eris's magic with Nightmare Essence and create a new piece of gear.
"To lose oneself to insanity is to lose all control over rationality. Some are forced into this path, others choose it. Beware those who elect this delusion—they pose the greatest threat." —Eris Morn
Legendary Quest Step