Play a two player game with one character who has very good stats and another character who you want the weapon for. Play at the Yellow Turban Rebellion under the hard difficulty setting and have each character equipped with a Red Hare Saddle. At the very beginning, put the character you want the weapon for near Sun Jian but not in a place where he could get hurt. Next, have your strong character fight Sun Jian. When he dies, he will drop a weapon. Let your strong character just stand there. He should have good enough defense that barely any health is taken away. Have the other character quickly run in, grab the weapon, and run out again. Then, go in the castle with the strong character and kill He Jin to end the level. You will almost always get the character's second weapon and sometimes even their third weapon. Note: You may have problems doing this with Zhang He.