The best way to explain is via the screenshot below:
So, all you have to do then is to pull the priest near the chest. Then wait mobs to come near you. Finally, vanish and jump. You can unlock the chest! Here is a point form explanation:
1. Pull the Mob as shown on the picture and then jump backwards (out of sight), so that he can't cast and starts running to you!
2. Wait for the mobs to be near you and use evasion and cloak of shadows
3. In the moment the first mob hits you put on sprint and jump down!
4. While falling down just vanish and click on the chest
I hope it will be useful for all you rogues!
Labels: auchenai crypts, chest, exploit, instance