Quote:
Originally Posted by Michael Thayne
Now if you magically fuse the slabs of a corbeled arch, I think it would effectively become a true arch.
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Nope, the distinctive feature of the true arch is its shape, not how it's held together. Shape earth would make construction of a corbeled arch somewhat easier, but it's basically math to figure out a true arch (side point: the 'find weakness' spell would probably let you build a true arch by trial and error, because stress points should show up as weaknesses).