
House Ordos is not featured in the Dune novels and is mentioned only in the non- canon Dune Encyclopedia.

The player takes the role of the commander of one of the three interplanetary houses, the Atreides, the Harkonnen or the Ordos, with the objective of wresting control of Arrakis from the other two houses. The weaponry and units also vary from house to house. The introductory, mission briefing and endgame cutscenes are different for each House, in keeping with their very disparate world views. The ultimate final showdown is the battle between the player's House against three enemy sides, among them Frederick's forces the Sardaukar (an unplayable elite force whose heavy infantry are particularly powerful). When the player dominates Arrakis on the world map, the two other enemy factions ally against their common enemy. Later, when the three Houses divide Arrakis among them, the player has to assault and capture enemy territories. In the first few missions the objectives are to establish successfully a base on an unoccupied territory of Arrakis, to harvest spice, and to defeat intruders. The player is a military commander from a House of their choice. War begins as deputations from all three Houses arrive on Arrakis. To achieve this, he now offers the sole governorship of Arrakis to whichever of the three Houses (Atreides, Harkonnen, and Ordos) delivers the most spice for him. Emperor Frederick IV of House Corrino is desperate for the harvesting of the valuable drug melange (also known as "the spice"), found only on the planet Arrakis, to pay off all of his debt incurred on internecine wars with family members.
