 Said to be the body of one of the three Progenitor Dragons that created the world of Eberron, Khyber is a massive subterranean realm beneath every continent that is filled with danger, dark secrets, and untold treasure.The Dragonmarked Houses are thirteen extended families which control most business throughout Khorvaire, that are based on bloodlines descended from families that first manifested dragonmarks.Within the houses, only a small percentage of every generation manifest dragonmarks, which are marks on the body that grant spell-like abilities to those born with them.