The symbol of the Iron Fist — that fun dragon tattoo — is the result of a hard-won battle with a mystical fire-breathing serpent living outside the city of K’un-Lun: Shou-Lao the Undying.

A symbol of prosperity. Where the Chinese dragon first came from is still debated by historians and archaeologists. But one of the most ancient images of the loong was unearthed in a tomb in 1987 ...