Hagmos

Tales from the old times tell that after years of warfare King sat down his throne and felt unquenchable thirst at the back of his throat. At which moment Hagmos son of Cupfiller approached the King and delivered these humble words that stayed in books of history ever since: "c(_)"

Albeit lack of mention it is commonly believed c(_) led to formalization of cha-dō.

c(_) was Macro Polo's expedition's most treasured piece until it someone drank it.