The Iron Horde is a faction in the World of Warcraft universe, specifically introduced in the expansion titled Warlords of Draenor. This group consists of various orc clans that have united under the leadership of Grommash Hellscream. They are characterized by their use of advanced technology and iron weaponry, which sets them apart from traditional orc tribes. The Iron Horde originates from an alternate timeline of Draenor, where the orcs never consumed the blood of Gul'dan, allowing them to remain free from demonic corruption. This faction poses a significant threat to both the Alliance and Horde, as they seek to conquer new worlds and expand their power.