Feral Sphinxes are more aggressive than Sphinxes.
Feral Sphinxes have 9800 hitpoints. They cannot be paralysed. Moreover, they are strong against fire and holy damage. On the other hand, they are weak against death and ice damage. These creatures can neither be summoned nor convinced. In addition, they are able to sense invisible creatures.
Feral Sphinxes yield 8800 experience points. They carry platinum coins and sometimes other items with them.