Critical Role's Matt Mercer is giving up control of a core pillar of the crew's booming business

Critical Role's Matt Mercer is relinquishing control of their fourth campaign to D20's Brennan Lee Mulligan.

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• Critical Role's long-awaited fourth campaign kicks off on October 2.
• One big change is that CR's chief creative officer, Matt Mercer, will not be the game master.
• Mercer is handing over control of the long-term campaign to Dimension 20's Brennan Lee Mulligan.

Critical Role's chief creative officer and longtime game master...