u get all the weapons for every except for there 4th weapon by beating empir mode with coa pi and ur officers have 2 b lu bu and gan ning no lutienits

What the hell are you talkin about

He means that u hav to be the main officers (Zhou Tai, LuBu, Cao Cao, etc.) none of the default leitenants that all look the same(Sha Moke, Coa Rui, etc.)

play empire mode and go to weapons smith and puirchase upgrades after every fourth upgrade a new weapon is avalible .....after you reach the final weapon upgrade/third weapon change the fourth will become avalible for the sword, spear, or mace/weapons icon. select a character i/e lubu eqip skypiercer kill 300 enimies at end of battle lubu will have skyscorcher