Brennan's latest trick on Critical Role is actually one he's done before—breaking with D&D tradition to let players choose when they level up, instead of just after they've taken a really good nap

Brennan Lee Mulligan gesticulates while describing an epic scene in Critical Role's new Campaign 4: Araman.

Critical Role's fourth campaign is a banger—and while I haven't kept up with it as much as I'd like (it's Christmas, you'll have to forgive me for not having four extra hours to put aside every week) I have still been tuning in and keeping up with secondary news when I can.

Thus it reached me through the grapevine (some people call it Polygon) that Brennan Lee Mulligan was changing D&D forever, shaking things up, the madman, the maverick! He was doing so by, as the video below from the official Critical Role channel details, allowing players to level up at a time of their choosing—doing the pesky things like rolling for HP in advance, but otherwise letting them hold off until a satisfying moment occurred.