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Dynasty Warriors: Strikeforce

Characters
Diao Chan - Finish "Battle of Hu Lao Gate" (5 Stars)
Dong Zhuo - Finish "Battle of Luo Yang" and "Battle of Mei Castle" (5 Stars)
Lu Bu - Finish Chapter 6
Yuan Shao - Finish Request Mission "Zenith Tower" (Chapter 6)
Zhang Jiao - Finish "Yellow Turban Rebellion" (5 Stars)

Fourth Costume

Earn 1,000 kills with a character.