Rune of Silence

Exploration Stage: Manor House Gate
From: Isabelle
Description: Thank you, Valerie. Now I know what we encountered. This anomaly is known as Sinister Shadows. It's a bit like Night Terrors, but even more dangerous. However, the way to deal with it was found long ago as it causes much trouble to treasure hunters. You can banish it using the Rune of Silence but Martha doesn't have it. You might find it in the Manor House but the Mistress is unlikely to part with it willingly, so you'd better sneak in at night.
Completed: According to the anomaly description, the Rune of Silence looks exactly like that. Let's hope the Mistress won't notice its loss. It's hight time we cleansed the City of the Sinister Shadows.