Every iron banner you can buy Lord Saladin's weapons and gear for whatever rank level he chooses to sell it at. Whenever you hit rank 3 or 4 you will be able to get what he sold the previous iron banner as a random drop. So, next iron banner at rank 3-4 will could receive Efrideets spear or Timurs Lash. This iron banner at rank 3-4 you could receive Jolders Hammer or Similars Wrath.