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.

Critical Role’s campaigns are known for being 100-plus episodes, so since we’re only 25 episodes in, it would be an understatement to say there’s still plenty to…