Night Watch sat, still and stoic. She stared out at the map of destiny before her, which would summon Twilight and her friends if any friendship problem arose. It would only call the ones suited. The problem would be cured. They were protected by destiny itself. No matter how frightening it might seem at the moment, they were literally fated to succeed. Just do as the table commanded.
Night rose a hoof and held it out, comparing the iron glint of its shoes against the crystal of the table. They were clearly different, but Night felt there was something bridging the two together. Something... She brought down the hoof with a dull thud of metal against crystal, and a second crystal fell from her loose grip. It was Silver's heart crystal. He wore it whenever he could. The warm purple glow it gave off... She looked at its dull black surface. No pony wore it, so it didn't shine. It reflected the situation perfectly. Why couldn't Silver be protected by destiny? Why couldn't she?
She grit her teeth in frustration. Twilight was crying elsewhere in the tower. She should be with the girl, crying with her, instead, there she was, being bitter and angry. "Why shouldn't I be?" She plucked up the necklace, paused a moment, then threw it around her own neck. It began to glow, but it wasn't purple. It gave off a gentle silver light that made Night shove herself upright, staring down at it with wonder. Was some portion of her husband inside it? Did she even dare to dream of it? She hopped down to the floor and spread her wings. "Twilight!" Her voice boomed more powerfully than she intended, shaking the walls lightly with its force.
Twilight scrambled down the stairs, almost falling in her hurry. "W-what? What is it? Are we under attack?"
Night held up her orb in two carefully cupped hooves, still glowing its gentle silver light. "Twilight, it is time for you to repay your debt."
Twilight's eyes went wide with understanding. She knew what the silver glow meant. Could she do it? What could she do? A dead pony was... well, dead. What would a fraction of Silver's soul, essence, or whatever a pony wanted to call it do? There was only one answer she could give that wouldn't tear her heart asunder. "I will learn more. I will fight for him, until that light dies, or we do."
Night smiled at her as tears ran freely from her eyes. "Our herd is shattered, but you know... You know, for this, if nothing else, my service is yours." Her teeth clenched. "You're involved. Use your damn rainbows."
Twilight didn't understand what Night meant by that. Rainbow power surely wouldn't solve the situation, but she didn't ask, she just nodded at Night Watch, taking in her intimidating form. She wore all five pieces of the artifact, and it made her look like a princess. A lunar princess, as Silver once had been. Though Silver never wore thick glasses like that. "He wouldn't give up on us," whispered Twilight as she began to descend towards her lab.
There was work to do.