‘As I build books, God builds people,’ the $10-million-a-year writer tells Wired — Brandon Sanderson is the Colleen Hoover of epic fantasy. Both authors, in their 40s, have armies of fans who have shown extraordinary loyalty to them: Sanderson’s by pledging $42 million to him on Kickstarter and Hoover’s by posting weepy, viral TikTok videos about her. But their differences go beyond his…