Cut down the Tamarisk tree to gain control of the Osiris piece box. Defeat the sons of Osiris guarding the second piece cart to gain control of it. If another player gets control of the Osiris piece box, you can regain control of it by bringing an army to it so it will automaticly convert to you. When you have cut the tree and gain control of the two piece boxes you will have an Osiris in your town use it to eliminate your ennemies.