Serpent Earrings

Serpent Earrings is an item solely found in Dynasty Warriors 5. For every 100 kills you get +2 attack added on your character, which on easier levels is the same as killing a general. It is used to train characters faster.

How to Unlock
At the Battle of He Fei while fighting for Wu, kill Xiahou Dun and Xu Huang within a minute of their arrival. Xu Huang arrives first at the southwest corner 5 minutes in. Xiahou Dun arrives in the northeast about 10 minutes in.

Trivia

 * Oddly enough, some people recommend using the Serpent Earrings for battle, even though it is useless if you already maxed out a character's attack stat.