Mares of Diomedes

The mares of Diomedes were a group of four female horses who ate human flesh instead of hay. Heracles once captured these monstrous horses only for them to eat one of his companions. In order to avenge his fallen companion, Heracles defeated the giant Diomedes and left the giant tied up in order for him to be eaten alive by his own horses.

Stymphalian Birds

Stymphalian Birds were a race of birds whose prey of choice was live humans. These birds were believed to be immortal as they were made not of flesh and bone, but of bronze. These monsters could launch sharp metallic feathers at their human prey in order to wound the human, then the bird would swoop down and carry the human off to the creature’s nest to be eaten alive.

Pegasus

Pegasus was a winged stallion whose coat was the color of freshly fallen snow; it was believed that the winged stallion was the child of the sea god Poseidon. Pegasus was seen as a heroic creature that would accompany only the most worthy heroes into battle. To be allowed to ride Pegasus was seen as a great honor and proof that the hero's cause was just and sanctioned by those on Mount Olympus.

Centaurs

Centaurs were a race of creatures that had the upper body of a man and the lower body of a horse; centaurs were only male creatures. Centaurs lived in the mountains and forests of Thessaly in great caves. Centaurs were not a violent race, but they were capable of violence when provoked and they often carried weapons made from branches and stone. Unlike many Greek creatures, centaurs were fully capable of human speech and could often be reasoned or bargained with by humans willing to put up with boisterous personalities.

Chrysomallus

Chrysomallus was a large ram whose fleece was made of gold; it was capable of flight and human speech. Chrysomallus cared about humans and once instructed Prince Phryxus to kill it and put its fleece on a nearby tree as a sacrifice to Zeus to save a village from Zeus's wrath. The tree that Phryxus put the fleece on is believed to protect the village from all those on Mount Olympus that would wish the village harm.

Nemean Lion

The Nemean lion was four times the size of an ordinary lion. The Nemean lion’s skin was so tough that nothing could ever pierce it; it was this factor that drove many men to hunt the Nemean lion as it was believed that anyone who managed to kill the lion could use its skin as armor and never be defeated.

Laelaps

Laelaps was a hunting dog created by the gods of Mount Olympus with the ability to always catch its prey. Once Laelaps had a scent, its prey could run from it, but never evade it for long. Laelaps did not always kill its prey as sometimes it brought the prey back to Mount Olympus, but never once did the creature fail in a hunt.