One-eyed giants, they are the sons of Poseidon and are very skilled blacksmiths, but not so much as elder cyclopes Instinct: to fill its stomach

• Stomps the ground to throw an enemy off balance
• Throw large rocks to crush their enemy
• Sweeps objects or their arms in order to send the enemy flying

The furies possess the heads of whichever Erinye they represent, with bloody eyes and crown of serpents. Instinct: to punish

• Follows Hades' command

The chimera is comprised of the parts of three different animals. It has the body and maned head of the lion. A goat's head is attached to its back. It has the tail of a serpent. Instinct: to hunt

• It prowls around in search of prey

He is lanky, with the body of a German Shepard. He has two heads, giving him the advantages of having basically 2 dogs in 1 body. Instinct: to herd

• Watches over its master's herds

Cerberus is an enormous, semi-transparent, "pure-bred rottweiler" with three heads, found at the gates to the Underworld. Instinct: to sniff out the living

• Keeps the living from getting into the Underworld
• It is semi-transparent and grows more visible the closer one is to death

Telekhines have faces like dogs, with black snouts, brown eyes, and pointy ears. Their bodies are sleek and black like seals. They have stubby legs that were half flippers and half foot, and human-like hands with sharp claws. Fully grown adults Telekhines can be up to seven feet tall. Telekhines bark and growl, and they waddle instead of walking. Instinct: to create metal works

• Swims swiftly and agilely through the water

Stymphalian Birds are a species of monstrous pigeon-like birds. Stymphalian birds have sharp celestial bronze beak that can tear through flesh. They are also incredibly quick and agile flyers. Physically speaking these birds are vulnerable to most attacks. The method for dealing with large group is noise. Loud bells, or music will disrupt the faculties of these birds, causing them to become greatly confused. Instinct: to swarm

• It strips its prey down to the bone
• It will call for more birds when it sees that there is prey or when it is in danger

The Scythian dracanae are described as humanoid females with twin serpent trunks instead of legs. They have been described as "Dragon women" or "Snake women". Their walk has been described as "a combination of walking and slithering like walking on living skis". When they talk, they hiss the letter "S" when they say it. Instinct: to attack demigods

• It slithers in order to move

Hellhounds are usually described as being large, black mastiffs with glowing red eyes. The average size of hellhounds are about the size of a grizzly bear or a rhino, but can be as large as a garbage truck. Instinct: to bring the souls of the dead to the Underworld

• Pounce on its prey
• It can travel between shadows

They being the size of a small to medium sized car, are rather large and intimidating when faced with the challenge of fighting or escaping. They have large pincers and sharp mandibles, the monster is usually a color corresponding to the type of terrain it lives in. Their soft underside is vulnerable to sharp objects. Instinct: to attack demigods

• To attack with its stinger