Goal: Open Xiangyang Castle's main gate within 6 minutes.
Stage: Assault on Xiangyang
Guide: Pretty simple, just play the stage normally. The gate will open when you defeat Cai Mao.
Time: 5:11, leaving about a minute extra.
Location: Immediately south of Xiangyang's main gate.
You must be playong on Hard difficulty or higher to get the weapon.
You must be playing as the required character to unlock the weapon.
You can only have 1 of the unique weapons.
And the audio is out of synch again. Notice how this only happens with Wu characters?