Labyrinth of the Minotaur features include a new race (The Minotaur), a new hybrid class (The Mauler), a new RvR dungeon, Mythrians, and additional Champion Levels (6-10). Introducing the largest RVR dungeon in Camelot history (Labyrinth) with access by all three realms located on Agrammon Island. Labyrinth introduced mythrians a new item slot, when equipped these myths will give small bonuses to your character. One of the most important benefits of the mythirians was that they allowed players to increase the stat caps of the item's respective attribute. Until this expansion, Mythic had never given each of the three realms the same race or class.
Source: Wikipedia, "Dark Age of Camelot", available under the CC-BY-SA License.