A Siren isn't really a sea monster but sailors have told tales of these beautiful women that sing to you and seduce you into their trap of bloodlust. They are said to eat the sailors alive or drowned them deep in the ocean.
Raven Lord by Christy "Goldenwolf" Grandjean. He is the Lord of Ravens, a werewolf that has a special bond with his intelligent corvids, using their magic to aid him. For wherever he is there will always be food for his shadowy companions.