Cyclopes are monstrous humanoid beings with one eye in the middle of their forehead. They were born between a union of Gaea and Ouranos, who was disgusted by his sons' appearance, he cast them into the depths of Tartarus. They are also fire proof, according to the Percy Jackson TV series. They are also amazing craftsmen, as they were able to forge Hades, Zeus and Poseidon weapons. They are heavily associated with Poseidon, who fathered many Cyclopes. Most creatures are born between Poseidon and a wood nymph.
