Pour SW 2 empires j'ai eu une confirmation. Pour avoir les 4 armes!
Fourth weapons:
Get the weapon that your character uses to level 4, then finish a battle with 500 K.O.s. You will get your character's fourth weapon after that battle.
Les 1000 Ko c'est pour débloquer les images etc....
All image galleries and scenes:
Unlock all the fourth weapons for each type of weapon and the 1,000 KOs medals for all characters.