Celestia simply chose to treat the Keyblade like she would alicorn -- the substance that composed a unicorn's horn, not the pony type she represented, that is. Her spell was simple and straightforward, building a corona of light around the weapon that formed a blade almost triple the length of the Keyblade itself. Being magical, it weighed nothing at all, but its expanded reach ought to give Eraqus far greater luxury to chop down Nightmares in greater numbers.

Celestia, for her part, spread her wings broadly as she stepped between Emizel and the small army, peering down at him to examine his injury. She was, after all, protecting him from further harm.