Thordak

Thordak is an ancient red dragon, even larger than other ancient dragons. He is (presumably) the leader of the Chroma Conclave.

Before the events of Critical Role, Thordak destroyed Byroden, killing Vax'ildan and Vex'ahlia's mother. At some point, Lady Allura and her adventuring party sealed Thordak in the Elemental Plane of Fire.

Vox Machina saw Thordak while Keyleth progressed in her Aramente with the Fire Ashari in. It is currently unknown how Thordak escaped from the Elemental Plane of Fire after those events.

In, Thordak led the Chroma Conclave on an assault against Emon, Westruun, and (presumably) other parts of Tal'Dorei.