Tech Dungeons & Dragons while social distancing? It’s free to try the newest ‘Critical Role’-inspired sourcebook. March 25, 2020 Jordan Culver, USA TODAY Comments Off on Dungeons & Dragons while social distancing? It’s free to try the newest ‘Critical Role’-inspired sourcebook. Dungeon Master Matthew Mercer is the mind behind Dungeons & Dragons' latest official sourcebook. There's a preview online, too.