Lycanthrope

Lycanthropes (from the Greek λυκάνθρωπος: λύκος, lukos, "wolf", and άνθρωπος, anthrōpos, man) were humans that were cursed and had the ability to shape-shift into wolf-like creatures. The first of the Lycanthropes was Lycaon.

History
During the Ancient times, Lycaon who was the King of Arcadia, tried to murder Zeus, but he failed. Zeus punished him and turned him into a Lycanthrope. He became the first of the Lycanthropes.

The Lost Hero
Seen in The Lost Hero, Lycaon and his Lycanthrope minions awaited Jason Grace, Piper McLean, Leo Valdez, and Coach Hedge when they were one the search for Aeolus. He ordered his minions to kidnap Jason, and kill Leo and PiperThey were later defeated when the Hunters of Artemis arrived. Lycaon was the only one to escape

Weakness
The only weakness that harms Lycanthropes is silver. The only thing that doesn't harm Lycanthropes is gold. When Jason attacked Lycaon with his gold sword, it didn't hurt him.

Known Lycanthropes

 * Lycaon