Warriors Orochi 2 - Shu Chapter 5 - Battle of Jia Meng Gate | Emerald Treasure Guide

To get the Emerald treasure, defeat the real Sun Wukong while Guan Yu and Wei Yan remain alive within 10 minutes. Stage is pretty easy, the hardest part is keeping your allies alive which you don't even need to do. Just take out officers with some speed and you're fine.