The moment the light dragon appeared, he felt as if his entire body was being tortured, and the aura of destruction continuously destroyed his meridians.
Guns also use graviton tech; the energy projectiles accelerate at absurd speeds and are enveloped in a gravity 'layer.' They punch through concrete with steel reinforcement like its tissue, and that is a simple mana projector. If he adds de-atomisation, even a simple gun could destroy buildings.