In order to get Liu Bei's level 11 weapon (King of Shu) change the difficulty to the expert setting and get an "S: rank on his Legend. To do this, kill all of the enemy officers without killing any of the peasants. The first few will charge directly to you. Otherwise, lure them as far away from the peasants as possible (Shadow Harness recommended). The last one is difficult because there are always peasants around him. Using the third charge to push him away from the peasants seems to work well. Note: Time may have an effect on your rank; make sure you do this as quickly and carefully as you can.