CelebriD&D with Joe Manganiello

 is a special episode of Critical Role. It was confirmed to be at least semi-canonical when Joe Manganiello's character, Arkhan the Cruel, reconnected with Keyleth and Percival de Rolo in.

Manganiello and his party find themselves in an abandoned temple while looking for an ancient relic. But it certainly won’t be easy! Mercer’s going to throw a lot of obstacles in the path of these adventurers, and not everyone is guaranteed to make it out of the temple intact. Along the way, an epic tale will unfold.

Synopsis
Tiamat, the Betrayer God and patron of chromatic dragons, sent visions of a locked-away loop of golden thorns and gems to her follower Arkhan in his dreams. Arkhan spent months of frustrating research seeking it out until finally coming across a monk of the Cobalt Soul named Duan who had the knowledge he needed. He hired a group of mercenaries—Keyleth, Percival de Rolo, the Headmistress, and Dupont Dupont—to help him delve into the Vault of Shumas in the Aggrad Mountains of Marquet.

After gaining entry, the party encountered and killed a few yuan-ti guarding the temple. Arkhan then barely took control of the undead caregiver there, and commanded her to show him to the artifact. She brought forth a manticore, who (following the caregiver's lead) willingly relinquished the loop—the Wreath of the Prism—on its neck. When Arkhan put the loop around his own neck, the thorns suddenly jutted deep into his neck and dealt him piercing damage, changed the appearance of his eyes, and changed his vision so that colors were more vibrant and he could see the heat of others' bodies. He then was able to command the manticore, on whose back the party flew from the temple, with the dominated caregiver following.

Player characters (all 5th-level characters)

 * Arkhan, a dragonborn oathbreaker paladin
 * Dupont Dupont, a dwarven rogue
 * The Headmistress, a human monk
 * Keyleth, a half-elf druid and member of Vox Machina
 * Percival de Rolo, a human gunslinger and member of Vox Machina

NPCs

 * The caregiver, an undead guardian of the Vault of Shumas

Trivia

 * The manticore was later named Chango (or Changó). Manganiello tweeted fan art of Arkhan and Changó with the hashtag #criticalrole.
 * Changó was included in the official Dungeons & Dragons adventure, "Baldur's Gate: Descent into Avernus".