The Hyup Do is a long-handled sword common in Korea and China, but it is not used very often on the battlefield. This Hyup Do is intricately ornate and was most likely intended for use in performances. It is well-suited for flashy moves, but in the end it is still just a performance prop and does not stand up well to clashes against other weapons.
Hyup Do is one of Seong Mi-na's weapons in Soulcalibur IV. It, along with Scarlet Thunder, is available by default. It has Impact Heal equipped by default as a skill, which when a player performs an impact, HP is recovered proportional to the strength of the impact.