I am implementing an almost-certain-to-be-erratic Friday Blog Post based on reader questions! Today’s question is a very, very old one: “What’s the most difficult part when constructing a system of magic for a world?” That is a Very Good Question. So, like, let’s take the Walker Papers and the Negotiator Trilogy, which are my two longest/best known serieseses. You would not *believe* how many books I read about shamanism, animism, and Native American cultures while preparing to write the Walker Papers. LOTS. MANY. BUNCHES. (I was frankly slightly less concerned…