HeroCooky
Unverified Monstergirl
Diplomacy if possible, Military approach when Diplomatic means fail/are unfeasable/impossible, and they are certain they can kill the threat. Or evacuating the region in which the Mystical threat is.@HeroCooky what is the Empire's plan if the Reaper/Nova or another Mythical beast decided to attack them?
Mostly the latter, as it is often cheaper to go away until the Mystical being wanders off.
Fractal Nova would be diplomacy and they would leave the Reaper alone, and evacuate the path it takes.