Monster

Monsters are offshoots of gods or cursed beings that would terrorize, fight, and often kill half-bloods. Monsters are "archetypes," born from the Chaos and Barbarism that always exist in the Western Civilization. This means that they are purely spiritual entities and will merely reform in Tartarus and come back whenever they are destroyed. One example is when Percy kills the Minotaur on his first day as a half-blood. Four years later, he sees the Minotaur again in Kronos' army. This proves to be an ordeal for heroes, for after a monster is killed it can reappear and attack again, in any time period between weeks and hundreds of years. They often serve as minions of evil and cause trouble for Olympus. However, some monsters, such as some dragons, Cerberus and the Furies serve Olympus. When most monsters are killed, it leaves a trophy behind in the form of parts of its body, it's clothing, or arment.

List of monsters
Some monsters mentioned or seen include:
 * Agrius and Oreius
 * Argus
 * Centaur
 * Cerberus
 * Charybdis
 * Chimera
 * Clazmonian Sow
 * Colchis Bull
 * Cyclopes
 * Elder
 * Northern
 * Southern
 * Dragon
 * Drakon
 * Echidna
 * Empousa
 * Erymanthian Boar
 * Feather-Shooting Bird
 * Flesh-Eating Horses
 * Flesh-Eating Sheep
 * The Furies
 * Alecto
 * Tisiphone
 * Megaera
 * Geryon
 * Gorgons
 * Medusa
 * Euryale
 * Stheno
 * Harpies
 * Hekatonkheires
 * Hellhounds
 * Hippalektryons
 * Hippocampi
 * Hydra
 * Hyperborean Giant
 * Kampe
 * Ladon
 * Laistrygonian Giant
 * Manticores
 * Minotaur
 * Nemean Lion
 * Ophiotaurus
 * Orthus
 * Pegasi
 * Peleus
 * Pit Scorpion
 * Scylla
 * Scythian Dracanae
 * Siren
 * Sphinx
 * Stymphalian Birds
 * Telekhines
 * Typhon
 * Ventus