The 'battle' hadn't really been a battle at all. The strongest attacks Astra Solamina could muster against the teal-coated, brown maned, hazel-eyed alicorn had been gently deflected, softly brushed aside, or countered with the alicorn's own mysterious not-magic to be rendered harmless. 'Who... who is this pony?!' the Empress thought, at the end of her rope. Finally, the Empress of Ponykind tried a last, desperate, all-out attack. "DIE!" she screamed in desperation and insanity, as she prepared to unleash an horrific beam of raw solar power from her mighty horn, directly at the mysterious Prince who supported humanity; who had helped the humans so much against her Little Ponies.
As her horn charged, the Prince merely gave Astra Solamina a smile - as if he was going to do, was doing, had done all of this before. That smile, filled with such profound sadness, chilled her to the core, wrenched her heart and sent shivers down her spine. As she made to fire, the Prince gently sat down upon his haunches, raising into the air a single forehoof. Then, as Astra Solamina fired her devastating weapon - an attack the Prince couldn't ever hope to avoid. counter, or deflect - she watched, bemused as he invoked his not magic; a single thin disc of power appeared over his raised hoof--and then the Solar Empress just goggled as her power struck his hoof, struck the disc... and was absorbed!
Awe and terror gripped her guts as Astra Solamina nee Celestia watched the Prince absorb her power, draw it into himself, and then ground it harmlessly into the Earth, with some sort of... impossible technique she hadn't ever seen before. Her power... it wasn't harming the Prince at all; even worse, he seemed to be asleep, or in some form of meditation. When at last her attack ended, and her well of power was dry, Astra Solamina collapsed to the ground, bursting into tears of pain and frustration; as she did, finally, the Prince opened his eyes and she was able to gaze into the unfathomable depths of his soul. What she found within made her feel so very, very small. "Shame. Disappointment. Such wasted potential," he conveyed with his gaze. Inhaling a soft breath, the Prince slowly, hesitantly, weakly got to his feet and made his way over to her even as she tried - and failed - to crawl away.
As he reached her - as she shivered, trembled, and whimpered before his diminutive form - gently, the Prince leaned down to whisper softly, sadly into her open ear, "Much to learn, you still have..." Eyes clouded with tears, the Prince slowly shook his head. Solamina couldn't believe it. She just couldn't believe it. She couldn't... she just... she.... she... Within her ancient mind, whatever hold upon her sanity she had left... snapped. A terrible, soul-wrenching wail escaped her, the Bag of Tirek falling away from her neck as she became irrevocably insane. The smallest of frowns graced the muzzle of the Prince then. He turned back to look at the Bag... and then, with but a thought he opened a tiny warp vortex beneath it, looking on as the Bag fell through it--into the very heart of the Equestrian Sun. It was done. Inhaling a softened breath, the Prince - feeling so very tired - sighed gently through his nose... and then he turned and slowly walked away.