Cam, dont you hate all these people questioning your work?
Isnt it simple enough to say that Raistlin made the Orb, but he cannot make others? Maybe he uses Action Points to simulate the feat? Maybe it, like the magical cream filling on a twinkie, was just born there in the tower? He was the greatest wizard ever afterall, cant we afford him this one slip up?
"I am a Knight of Solamnia. I am the hand of Paladine, of Kiri-Jolith, and of Habbakuk on this world. You are on Krynn. You are mine, Queen of Darkness."
—Huma Dragonbane, The Legend of Huma