Duncan Campbell's Lodestone Collection

Origin
Duncan Campbell was a deaf man who acted as a soothsayer, prescribing fortunes in early 18th century London to the wealthy. Alongside his powers of prophecy, Campbell also peddled medicinal treatments, including lodestones, mystical powder and genie spirits.

Effects
A relatively small collection lodestones used to 'convey the souls of the dead' by duplicating a subject’s speech and vocal patterns. They were given the ability to produce spectral voices at the cost of the handlers’ voice. Also grants a slight degree of predictive ability, allowing them to see up to a few days in advance.