Designing the Tower
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It is for individual troupes to determine the style and design of the tower they want to create, but the following elements are likely to play a part.
The ritual magic described later, and the assumptions concerning mundane craftsmen, are based on a circular tower structure a little over a mile in circumference, around 2000 feet in diameter, and with individual levels each 20 feet tall.
The foundations are likely to be columns sunk into the earth. These columns would take and spread the weight of the tower, with more pillars being sunk across a wider area as the tower grows in height.