If there is one, please forgive the post and direct me to it. I have not seen it in the spell directory.
I know teleporting armies is a very powerful ability, but with as slow as Champions are for much of the game now, on large maps it would bring the game to a stop to turn back and give the item to another champion in another corner of the map, and you cant courier them with a lesser unit. Some items aren't right for the Champion that discovers them, but would be for another.
Otherwise you're not likely to be able to use the loot you find by the end of the game, which isn't much fun. I'd be fine if it cost the same amount as the army teleportation spell, but was non-elemental, so anyone could cast it. Just something that allows you to open a trade window with a non-adjacent army.
Again, if I've completely missed some game feature that addresses this issue, I apologize.