House Orien across the face of Eberron. While all members of House Orien are humans, not all members carry the dragonmarked Mark of Passage. House Orien contains both the Couriers Guild and the Transportation Guild, though anyone working for those guilds are not immediately considered a member of House Orien. House Orien also maintains the caravan routes and lightning rails that criss-cross the continent. They are based out of Passage in Aundair, but have enclaves across the continent of Khorvaire.