Dark Ages is an MMORPG, based on Celtic mythology, originally developed by Nexon and now operated by KRU Interactive. It is loosely based on the Korean game called Legend of Darkness. The American version was developed by David Ethan Kennerly who based it somewhat on the works of horror writer H. P. Lovecraft. The game originally thrived on player involvement in the management of the game and progression of the storyline, even going so far as allowing players control over in-game politics and laws.

The backstory essentially is that a long time past, the people called Tuatha de Danaan ("Children of Danaan") arrived in the lands of Temuair, meaning Earth-Sea in the Tuathan tongue. There was formed the civilization called Hy-brasyl. It was a peaceful time, in harmony with nature. For the first time, after a millennium of peace had existed, a man is found murdered, and exploration into the outside world begins. With this comes the harnessing of the elements for magical power.

Along with this exploration, Kadath, the worldly home of the Gods, is discovered. Dark altars and temples are constructed, and the Priests of these Dark Gods go crazy in their search for Godly knowledge. In this madness, Hy-brasyl is drowned, with the death of all those who know the forbidden knowledge. Over 300 years go by until the knowledge is regained, and along with the four other elements (Fire, Earth, Water, Wind), a fifth is discovered: Darkness. With this discovery come the Dubhaimid, the dark ones. Formed by the Dark God Chadul, these dark forces terrorize Temuair. The wise amongst the Tuatha de Danaan return to the worship of the Light Goddess Danaan, who enters into the Great War with Chadul.

Many years later, the Six Lords of Temuair meet to form an unholy Pact with Chadul. Led by Tenes, King of Ardmagh, the Anaman Pact is formed, granting each of the Lords a 1000 year lifespan and the unity of Temuair. In the ensuing war, Danaan`s chosen Paladin, Ainmeal, fights against Tenes in battle and wins, ending another dark threat. Ainmeal renames Ardmagh to "Loures." Again much time of peace passes, until the 4th Empress of Loures, Ealagad, comes to power. She seeks to rekindle the power of Chadul and does so, restoring the Dubhaimid to Temuair. Danaan again intervenes, this time by sacrificing Herself in order to defeat Chadul for the final time. With the end of this Shadows War, the first of the Aislings (Dreamers) are born, free from their old mundane life, and making a difference in the new Atavism Age.

Each Temple has a clergy made entirely of players. Players may hold any of the following ranks: Probate is the rank of initiated, unregistered players. It is also the rank of any Priest who has been the target of a heresy action. These people have the ability to pray when in the Temple of their God. Worshipper is the rank of initiated, registered players. These people have the ability to pray in the Temple of their God or when elsewhere, by use of their Prayer Necklace. They may also be sent on religious geasea by any Priest or higher of their Temple. Acolyte is the rank of Clergy-Helper. These people must be appointed by a person of rank Priest or higher. They have all the abilities of a Worshipper, as well as the ability to summon creatures of their God. They may also receive Holy Symbols of their God from a Cleric or higher. If a Priest or a Wizard, they may also receive a Holy or Magus staff of their God. Acolytes also have the ability to remove an enemy God`s blessing from an item. Acolytes are also the only people who may begin a heresy action, which removes a Priest or higher from power. Priest is the lowest rank of the actual Clergy, and is obtainable only by members of the Priest class. To become a Priest, you must have been an Acolyte for two double-moons (two weeks). Priests have the ability to initiate new worshippers, banish people from the Temple, and consecrate items (adding their God`s touch to the item). They may also invite unregistered people into the Temple. Priests have the ability to hold a Mass, which gives all present worshippers of the Trinity 50k experience. Priests can also destroy items if they are touched by an enemy God, or may simply remove the enemy God`s touch. Priests are also able to send Worshippers or higher on Geasea. Cleric is obtainable only by those who have won a rank of "Clave" or above in any contest. They must have initiated at least 40 people in order to obtain Cleric alone, or 20 people if assisted by a Minister or higher. Clerics have all the abilities of a Priest, and may also create Holy Symbols, Holy Staves of their God, and Magus Staves of their God. Minister is obtainable only by those who have won a rank of "Village" or above in any contest. They must have initiated at least 40 people in order to obtain Minister alone, or 80 people if assisted by a High Priest. Ministers have all the abilities of a Cleric. High Priest is obtainable also by those who have won a rank of "Village" or above in any contest. They must have initiated at least 160 people into their Temple. High Priests have all the abilities of a Minister, and may also excommunicate members. This act will cause the High Priest to lose ten initiations, lose all of his faith, and will forcibly remove any member of the Fellowship from the Fellowship.