imagine a siege on a floating citadel guarded by fearsome fire breathing wyverns

siege floating citadel guarded fearsome fire breathing wyverns imagination defenders attacks fortresses skies dragons aerial fortification tactical battles fireballs warfare stronghold phantasmal soaring invasion barricade hovering ramparts battlements mythical towering campaign embattled besieged assault dungeons medieval troops skyward conquer siegecraft engulfed enflamed monstrous fortitude floatingfortress expanse vantage breathtaking imagine