[Thick black storm clouds grew, lightning and thunder clashed through the skies as rain and hail began to fall. The winds picked up, not that they needed that, and lightning began to strike anything close enough for it to channel through. The storm grew in intensity as Tyrnen poured more mana into his book. Soon it was more a lightning storm than anything, crashing every which way. The downside to conjuring this storm to such an extent however was the lack of control over it. He could make it bigger, more powerful, or he could dismiss it. But he could not direct it in any particular way.]
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