It started as an experiment.
Having been thrown out of the Devil Wheel, Arwen was placed in a situation where she had to learn from scratch.
Starting from the meaning of her domain to its wide range of capabilities.
Thankfully she had Nadia to guide her and her studies as well but even then, she'd only managed to find a way to exert her will on the world without requiring a gesture.
Her first attempt… was what led to the conflagration currently rampaging through the buildings in the city underneath Thebes.
Perhaps due to how it arose, Arwen was unable to compose herself, leaving her stunned as she watched the flames dance in a certain rhythm.
"... What have I done?" She muttered, already expecting the scene of watching the buildings that carried so much history, degrading as a result of her flames.