The Forlorn Spirit appears a few times throughout The Legend of Stalvan quest chain. She will cast the Curse of Stalvan (-5 to all attributes for ten minutes) on you if given the chance. She will also cast polymorph (sheep).
There is a delay when she first appears before she attacks in which you should be able to run away if you do not want to confront her.
Oddly, she has a neutral aura, even during combat (noted during Moonbrook encounter.)
- Curse of Stalvan (Reduces all of an enemy's attributes by 5 for 10 min.)
- Polymorph (Transforms the enemy into a sheep, forcing it to wander around for up to 20 sec. While wandering, the sheep cannot attack or cast spells but will regenerate very quickly. Any damage will transform the target back into its normal form. Only one target can be polymorphed at a time. Only works on Beasts, Humanoids and Critters.) Same as Mage's Rank 1 Polymorph.
She will spawn when you accept the following quests: