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Message: <blockquote data-quote="Wulf Ratbane" data-source="post: 75313" data-attributes="member: 94">I would reference PH p. 136, table 8-15.In the absense of more detailed rules, I would use the hardness and hit points given for a 5-foot section of wall. You might want to let the dragon use the Break DC rules instead-- his strength may be high enough to hit a DC35 or even DC50.I would also let his breath weapon directly affect the building. Ice is not friendly to stone-- trapped moisture will turn to ice and expand, cracking the stone apart. This is more of a concern with masonry stone than hewn stone-- but then I doubt the PC's fortress is hewn from a single block of virgin stone.So-- with his claws, the dragon could reasonably affect only a single 5-foot section, which would have hardness 8 and maybe 90 hit points. He could punch a 5x5 hole in a wall-- and at that point is when I would check for collapse. A 5x5 hole that represents perhaps 10% of a building or wall = 10% chance of collapsing the adjacent/above/below sections. And then just sort of daisy chain it from there until it is either completely collapsed or it holds at some point.If he has a Tail Sweep, I would let his tail crack multiple consecutive sections of wall with a single sweep.If he breathes, he may very well affect the entire structure at once. This is the easiest and most direct way for him to destroy large sections at a time. (He might freeze entire sections first and then shatter the brittle stone...)I'd have some kind of 3D representation of the map ready. God, what a blast I would have collapsing a building around the players...Wulf</blockquote>

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