Vax'ildan is a fictional character from the popular tabletop role-playing game Dungeons & Dragons, specifically featured in the web series Critical Role. He is a half-elf wizard known for his intelligence, charm, and a penchant for mischief. Vax'ildan is a member of the Mighty Nein, a group of adventurers who embark on various quests and challenges throughout their journey. In the series, Vax'ildan is portrayed by voice actor Liam O'Brien. His character often grapples with themes of loyalty and sacrifice, particularly in relation to his twin sister, Vex'ahlia. Vax'ildan's abilities include spellcasting and stealth, making him a valuable asset to his party in both combat and exploration.