I'm not sure, way back when there were two dragons attacking Larry's tower, one was killed by the other (and Madman Rogovich), and the other was turned into a rabbit by the magic inside the tower, neither was able to breach it by force. And if the Shadow Mage has strengthened his rooftop against further incursions... it may be a long battle to do much of anything inside (not to mention having to stay out of the reach of the shadow giants)
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