"In case you're sick of hating the author for his misogyny, you can start hating him for his obsession with crappy rules. If you want to create a druidic circle, then you have to use the following formula: Result = (Ae) + Ae(N1/2-1) That quiet chomping noise you're hearing is the noise that my backbrain makes while it's eating my forebrain, out of rebellion at having to do this. What the formula there suggests is something like number of druids versus time of season or something or other; I don't really care. If you have to do binomial equations in order to figure out how large a circle is, rather than abstracting it, I'm not interested."