A gold holy symbol of Asmodeus on a silver chain, found on the rotting corpse of a male tiefling in ruined leather armour, chained in one of Zaldara’s cells for a couple of months (S1). Kintergas recognised it at once (“Oh, shit.”) and took it.
Who the tiefling was, and why a lich held a worshipper of Asmodeus prisoner, is unknown.