Did you mean Scylla?
Scylla
noun
°A dangerous rock on the Italian coast opposite the whirlpool Charybdis on the coast of Sicily. The passage between Scylla and Charybdis was formerly considered perilous; hence, the saying between Scylla and Charybdis signifies a great peril on either hand.
°A personification of the above rock as a ravenous monster.