- See also: Four Fiends.
According to the ending of the game, the Fiends are manifestations of Garland's immense hatred. The Fiends sent Garland 2000 years into the past in order to create a time loop that would revive him every time he was defeated by the Warriors of Light. In turn, Garland released his creations into the future to wreak as much havoc as possible.
Four hundred years before the Warriors of Light appear in Cornelia, Tiamat destroyed the Lufenian civilization and made their Flying Fortress, home of the Wind Crystal, her roost. Two hundred years later, Kraken invaded the Sunken Shrine, home of the Mermaids and the Water Crystal.
Closer to the game's beginning Lich had begun to rot the land near Melmond from the Cavern of Earth where the Earth Crystal awaited restoration, and after Lich's defeat Marilith awoke and took up residence in Mount Gulg alongside the Fire Crystal. Each Fiend must be defeated at least twice, first at the above areas to restore the elemental crystals, and then at the Chaos Shrine, 2000 years in the past, to gain access to Chaos.