Get your Air Magic to 15. Get Resurrection. Kill your teammate but cast Resurrection 
immediately afterwards. Then, neither of you two will be able to hit each other.

Online sword
Start a game on Komorin. Go directly straight into town until you see a man that is 
a trainer in a light green armor. His name is usually Drof Skelbur. Kill him and 
take all his items, especially his sword Anathros. End the game and repeat the steps.
Combine the armor and swords until desired class.