In Egyptian mythology, Khepesh (“The Thigh”) is the Iron of Set. This powerful force was once a part of Set Himself, but it was removed from Him by Horus during Their war for the throne of civilization. It is sometimes described as being Set’s “bone,” “foreleg,” “semen,” or even His “testicles” (which means its removal is sometimes described as a “castration”). This Iron is what enabled Set to kill Osiris, and it was returned to Him once He was “tamed” enough to be reconciled with the rest of the gods. Set now uses Khepesh to defend Ra from the Chaos Serpent, and its physical counterparts in nature include the asterism we know today as the Big Dipper, as well as the chemical element Fe (iron).