CSA0718: Carroll: What happens when you make a magical polygon which isn't regular?
Broadly speaking, irregularity results in a loss of efficiency. The more regular the shape is, the better the spell will work.
If it's not regular enough, the worst case scenario is that something explodes when it isn't supposed to, or vice versa. Your first attempt at a pentagram, which was before you'd even gotten triangles down, did not end well.
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