Diao Chan: Level 10 weapon:
Play the Battle Of Si Shui Gate level on Dong Zhuo's Side. Allow Sun Jian's messenger to complete his task. Then, wait for Sun Jian to defeat Hua Xiong. You must now defeat Sun Jian and Cao Cao to gain her level 10 weapon, Diva. You must quickly do this before your forces retreat and you lose the map.

Play The Battle Of Si Shui Gate level. Sun Jian will send a messenger to Yuan Shao, and you must let the message be received before you defeat any enemy officers. After this, defeat two officers out of Sun Jian, Liu Bei, or Cao Cao. You should receive a message stating "Diao Chan has earned her ultimate weapon, Diva". Then, complete the level.