Speaking to author Martin Cahill feels like looking into a mirror. We both dabble in writing in the fantasy genre: Cahill professionally, I in my downtime. But Cahill has gone a big step further than me: He secured a dream gig creating a book for the nerdworld empire Critical Role. Cahill is the wordsmith behind "The Armory of Heroes," a fantasy compendium CR released in July. The 216-page book features detailed artwork of relics, armor, and weapons from CR's campaigns, the long-running Twitch