Make sure you have enough Perfect World Gold in the game and you are playing the game every time. Your main focuses are to Stay Alive, Constantly Build up Chi, and Keep the Mobs Aggro. SPAM Flesh Ream to make the mobs attack you and not your fragile party members.

Flesh Ream does stack bleeding damage, which is what helps maintain aggro over time. Try adding a couple skills that don't consume in between Flesh Reams to prevent your bar from being empty. You could use roar if there are multiple monsters you have to tank. However, it sets the aggro to a set level, usually much lower than if you were spamming Flesh Ream. Plus, Roar has a long cool down time, so use it only when you get mobbed. Use Devour only when you have aggro the mob previously. It is also great for reducing the enemy physical defense, but uses it sparingly because it costs quite a bit of Perfect World Silver, which can run out quickly when used in combination with Flesh Ream. Use Sunder to recover lost HP. Use Surf Impact once in awhile to reduce the mobs' speed, in case they choose to run away from you and attack your party members. That way, you'll have more time to lure the mobs back to you.