Cursed bottle

Exploration Stage: Manor House Gate
From: Isabelle
Description: Martha used magic to keep away the mistress's admirers who interfered with her work. Perhaps the mistress didn't like that. What kind of magic did the mistress use against Martha to make the fog appear? Have you seen a vial with a pentagram in it at the gate? Look for it.
Completed: Oh! Just as I thought. This is the Witch's Vial! It repels the magic cast on its maker. But it's not enough to create a mist. Something's missing.