Published Apr 29, 2026, 10:34 AM EDT Every DM should be stealing this idea Brennan Lee Mulligan only had one rule for character creation in Critical Role Campaign 4 Image: Critical Role Campaign 4 of Critical Role has been a breath of fresh air for a variety of reasons. The actual-play Dungeons & Dragons show not only has a new Dungeon Master, with Dimension 20's Brennan Lee Mulligan taking over from Matthew Mercer, but also has a great new world of Aramán and an eclectic cast of characters to explore. However, as any Dungeon Master worth their salt would tell you, starting a new game means laying down the groundwork for what does and doesn't fly in a campaign. This can be as simple as swapping how items or spells work, or as game-changing as adding house rules that shake up combat. Speaking to Critical Role cast members Liam O'Brien and Taliesin Jaffe, Polygon learned that Campaign 4's DM was pretty collaborative and open-minded with the characters the cast were making.…