The Nine-Headed Sea Serpent is a Lovian fantasy novel by William Goodwin, published April 1, 2009 by Goodread Publishings. The book is the last part of a trilogy centering around a boy named F'ril and his adventures as a dragonslayer. In The Nine-Headed Sea Serpent F'ril travels to the land of Elmtin-Luzur to battle a Hydra.