//------------------------------//
// Rot 
// Story: Book 1 - The Behemoth came to Canterlot 
// by Equimorto 
//------------------------------//

Twilight approached Stella slowly, slightly stumbling, keeping her eyes on the other as the alicorn did with her. One wrong movement from either of them and her whole plan risked falling apart, but it wasn't like she'd had much of an option in her previous situation. She doubted her actions every second of the way towards the ruins of the building Stella was standing on top of, but when she finally got to the edge she had nothing else better she could try. It wasn't going to be nice, but she needed to win that battle, and sacrifices had to be made. She just hoped her guess was correct.
Suddenly, Twilight unleashed a spherical wave of magic from her horn, spreading all around and passing through the entire city as it expanded and accelerated. Stella's first instinct was to fire at Twilight, and when the blast was deflected by the oncoming spell she put a shield around herself. But there was no need for it, the tide washed over her barrier without pushing on it. Stella was confused for just a moment, and that moment was enough for the spell to reach the edge of the city with its growing speed. Once she actually realised what Twilight had done, the other was already flying away, and Stella was stuck forced into doing the same over tackling the alicorn for the sake of saving herself.
Flying high above the city, magically propelled at speeds her wings wouldn't have been able to reach by themselves, Twilight was a combination of pleased and horrified at seeing the successful result of her actions. Like she had guessed, Stella had already planted her scale in the city before the previous morning. Like she had guessed, Stella hadn't removed it yet. The spell she'd cast had just triggered its reaction, and with how much magic she'd poured into it, while lacking both the knowledge and skill the other had in the matter, the resulting explosion was going to be massive.
Twilight watched it grow, a bubble of pure white light spreading and rising from a bridge, engulfing the whole structure and growing still. Bigger. Faster. Gaining ground and height and consuming more of the city, every moment more than the one before. Still accelerating, and still growing. It was climbing faster than Twilight was and there was no telling when it would stop. Terrified by the full consequences of what she'd done, but even more so fearing for her life, Twilight lit her horn once more and teleported away.
Stella's eyes were glued to Twilight as the alicorn rose through the sky, and meanwhile her feathers and tail felt the prickling of energy from the reaction bubbling behind her. She'd moved after Twilight and she wasn't going to be fast enough to avoid the wave, not that that actually mattered. She saw Twilight finally understand the gravity of the situation, finally beginning to teleport away, and she latched onto Twilight's magic with her own, following her.