Landor watches as his Lord desert the King's Legion and joins the Horde.
The Horde is the union of many smaller factions, including Bloodrage Clan, Sisters and Sons, the Trolls, Mechastone Defense Force, Knights of the Way, the villagers of a little village up the coast, Lord Gaten's villagers and the deserters from the King's Legion. The Horde's capital is Kethenecia, and the entire faction was previously under the leadership of Cale'anon Vatay.
Its name was never mentioned, until in Candor with Landor. Although it might have just been a joke, referring to World of Warcraft's Horde, which is highly similar.