Corporeal Essence

Corporeal Essence is an item used in the Halloween 2009 Quest. It is made by combining four Corporeal Residue. Double-click any residue to form the essence. The essence has a timer of 10 minutes.

Double-clicking the essence turns you into a Troll, Terathan Matriarch or Stone Harpy. While in this form monsters will not attack you unless they saw you transform or were attacking you prior. While in monster form you can see Lingering Essence which appear as red sparkles inside Anti-Virtue Dungeons.

Taking any type of damage will knock you out of monster form.