Nightmare Moon vs. Corona
Nightmare Moon and Corona stared each other down, waiting for the announcer to give the word to strike. The announcer says "Remember, you can channel power form other planetary bodies, with no limit to the amount. Ready, set, fight!"
As Corona starts channeling power to her horn, Nightmare Moon starts moving around and making storm clouds that would rain on Corona and shock her with lightning. Corona barely noticed the clouds until she was rained on. Corona's powers were mostly fire-based and were cut off by the rain. As Corona tried to destroy the storm clouds ,which had been specially enchanted to dodge attacks and move with Corona, Nightmare Moon was channeling power into her horn from the many moons in all of the universe and all the alternate universes as well.
Then, Corona starts blasting out massive waves of pure heat. Nightmare Moon's clouds were water-based magic, so they evaporated immediately. Nightmare Moon's attacks were more water and ice based, so she had a lot of elemental magic experience. She knew that clouds may not be the best idea in this situation. Corona was now channeling power from Equestria's sun, in her universe and Nightmare Moon's universe.
