The fighting within Alchemy City was chaotic. The Floating City was unable to get close, so it resorted to attacking with rocks. The city's territory was incapable of slowing down the rocks. Alchemy city had the most difficulty with pure physical attacks.
There were skills summoning meteorite, but skills like that were imbued with intense elemental vibrations. The city's territory would be able to lock down on the spells and destroy them.
The rocks were different. They were almost incapable of invoking any elemental resonance for being pure physical attacks.
The rocks raining on the city worked better than magic spells. Furthermore, dark clouds appeared above the Floating City. The clouds were low and shrouded the Floating City. Rocks rained from the clouds, making it seem like the heavens were throwing a tantrum.