Sun Ce's Level 10 weapon in Dynasty Musou 3 was not something that could only be obtained by defeating six generals. After completing the quest "Conquering Dong Zhuo", you will receive a Level 10 weapon called "Overlord's Sword". This weapon is obtained by defeating 6 specific enemies. These enemies had different positions and characteristics, so they needed to complete different missions to defeat them. After completing the quest, you can enter Dong Zhuo's castle. There, you can challenge Dong Zhuo himself and defeat him to obtain this Level 10 weapon.