• Martin Cahill is the writer behind Critical Role's "The Armory of Heroes." • Cahill told Business Insider what it was like going from fan to collaborator. • He also provided his tips on how to network your way into a good gig in the publishing industry.

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 stream that's a mainstay of the company

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