I’ve had this concept for a while, but until now, I didn’t have a Libra Pocket Watch. Now that I do, here’s the concept:
Fire/Water: Steam Blade
Light/Dark: Annihilation Blast
Ice/Wind: Blizzard Hurricane
Earth/Electric: Magnet Crusher
Dual Libra is a Keyblade of Time that represents balance. It’s unique in the fact that it can use two elements at a time, yet must be using opposing elements, such as Fire and Water. the elements will show from the Keyblade’s teeth, showing on both sides.