‘Depends on the coin. There used to be loads of different ones. Sotocastra like this one to open locks, orocastra to help you find water or gold.’ He nodded to the man in the toga. ‘Castradazi like Savire here used to be folk heroes. Some years back the lords mercantile decided they were tricksters and thieves, sent the secret police after them. Now there aren’t but a few left, and probably even fewer of the coins.’