Very cool--although I think there should have been one epic item that represents the stage it is from and it only appears once a battle (if even less often then that).
YES! The SuperBot team emphasizes many "Easter Eggs" are in this game. If they had an Ultra Rare Epic Item for ever stage I think the replayabilty would rise especially if they made using this weapon a trophy. I think it would be an extra strategy looking out for the item as well as fighting. But it's rare.
Maybe it comes out of the sky slowly with a ray of light and everyone runs to it trying everything to get their hands on it.
But if you get hit once you drop the item and the item takes about 3 seconds to activate.