Dynasty Warriors 4: XL - Legend of Sun Ce - The Shadow of Sun Ce

In this stage you have to defeat Yu Ji multiple times. He has a pattern of a strong Yu Ji, followed by multiple weak Yu Ji's. The strong Yu Ji must be defeated for the stage to progress but disappears after a certain amount of time. The more times he appears, the weaker he will become. Yu Ji is also the only generic I've seen to do musou attacks.