|First appearance:||Chaos 101|
The Underworld (seen in episode Chaos 101, Man's Worst Enemy and episode Road to Hades, Cold Day in Hades) - The ancient Greek realm of the dead, ruled over by Hades and his wife, Persephone. The three-headed dog Cerberus guards its gates, Campe guards its prisoners, Minos judges the entering souls, and Charon ferries the dead across the river, but only if you pay him with gold coins. The deepest area is Tartarus, where Cronos was imprisoned after his defeat at the hands of Zeus.. You must be dead in order to enter, although the heroes circumvent this rule by sneaking through the picture of the The Four seasons in Persephone's solarium. There are also other secret passages, but Chiron is adamant that they remain so. Asphodel grows plentifully, but wandering off the path that leads to it will turn you to stone. In the first episode of season 2 Cronus takes over the underworld and unleashes Thanatos on the heroes but is eventually defeated yet again.
The deepest area is Tartarus, where Cronos was imprisoned after his defeat at the hands of Zeus.
Heroes reside in Elysium, the one place in the underworld that isn't dark and gloomy, but idyllic and peaceful instead
Plains of AsphodelEdit
In Greek mythology, asphodel is a plant sacred to Persephone and grows in the Underworld. There is an entire field of aconite growing in the field, but anyone who steps off the path to enter will turn to stone. Odie solved the problem by putting the path's dirt into his shoe so technically he is still on the path.