Kern

Kern "The Hammer" is a Half-Orc and a multiclassed Barbarian/Monk. Kern fights in a Vasselheim arena called the Crucible. As an NPC, he is portrayed by Matthew Mercer.

Kern vs. Grog
When Vox Machina arrived in Vasselheim, Grog challenged Kern (who had not yet multiclassed). Kern emerged victorious, but it was a close contest with a narrow victory. While Grog went about his business with other tasks, Kern devoted himself to training as a monk, multiclassing as a Barbarian/Monk. Grog returned, and although Kern's new abilities were formidable, Grog managed to defeat Kern—though, again, the victory was narrow.