- Salakk, the Salt Wyrm of Las Salines, was obliterated by Carmen in 1230, only to return in 1235
- Saul ben Asher, past companion.
- Selim ibn Ahmed, a Jann-blooded bedouin.
- Siccus Al-A'War Ex Bonisagus, visitor.
- Silvia, Solomon's servant
- Solomon of Guernicus, Master, Inquisitor, Pontifex Minore since 1236. A pious magus plagued by a demon, dedicating his investigative abilities to the Order.
- Sophia, owl familiar to Solomon of Guernicus.
- Princess Soteira, King Triton's eldest daughter, and Roberto's true love.