Born in Byroden, he and his twin sister Vex'ahlia were raised there by their mother Elaina until they were taken to live in the elven city of Syngorn at the direction of their father, Syldor Vessar. Vax'ildan and Vex'ahlia were unhappy there, and left in their teens to be on their own.

During his adventures with Vox Machina, he came into possession of the legendary Deathwalker's Ward and Whisper to fight the Chroma Conclave. Vax'ildan offered his life in service to The Raven Queen to save his sister, and after his own death, was brought back to life by her to defeat Vecna. He then abandoned his mortal form to become the champion of ravens.