Published May 11, 2026, 12:35 PM EDT World-building doesn't have to be a lonely affair Brennan Lee Mulligan's handling of Campaign 4 shows how to be a great Dungeon Master Graphic: Polygon / Images: Critical Role, Wizards of the Coast and Tyler Jacobson Critical Role Campaign 4 is vastly different from its previous three campaigns. The cast size has doubled, and its setting is the godless, war-torn world of Aramán. The biggest change, however, is that instead of Critical Role's usual Dungeon Master , famed voice actor Matthew Mercer, Campaign 4 is led by Dimension 20's Brennan Lee Mulligan . After talking with the Critical Role cast earlier in May, it’s clear that despite the various differences in Campaign 4, Mulligan’s management of the campaign so far proves he is just as skilled as Mercer at showcasing what makes a great Dungeon Master.…