Go to any chest in a dungeon that has an orb and open it, then use the magic rope to teleport to the entrance of the dungeon. Go to the nearest watt and have him forge the weapon. then return to the chest where you found the orb and another of the same type of orb will be there. repeat this process as many times as you'd like. (note: Do not forge your weapon past its highest phase or it will be turned back to it's very first stage i.e. if you forge your sword to its 9th and final stage the forge it once more it will become the rusty blade.)