Raishan

 is an ancient green dragon and a member of the Chroma Conclave. As an NPC, Rhyshan is portrayed by Matthew Mercer.

Background
In, Cerkonos revealed to Keyleth that a young girl named "Rhyshan" came to Pyrah about four years before the Chroma Conclave attacked Emon. Appearing as a fifteen-year-old human girl, she had great power, but Cerkonos didn't understand her true nature as a green dragon. Rhyshan, somehow, helped release Thordak by ripping open a rift to the Elemental Plane of Fire in the side of the volcano.

It is unclear if Vox Machina saw Rhyshan in her humanoid form during Keyleth's Aramente in the episode.

Introduction
Rhyshan was the third member of the Chroma Conclave encountered by Vox Machina (the first being Brimscythe, whom they slew before the Critical Role stream, and the second being Thordak, from whom they hid while in the Elemental Plane of Fire in ).

In, Rhyshan encountered Vox Machina when she and the rest of the Chroma Conclave interrupted Sovereign Uriel Tal'Dorei III's abdication speech and laid waste to a large group of Tal'Dorei Council members and other political and economic elites in Emon. Uriel died from this attack, Gilmore was wounded, and some members of Vox Machina nearly died, as well.

Upon conquering Emon, Thordak, leader of the Chroma Conclave, ordered Rhyshan and Umbracil to their next objective; they obeyed and flew east. The next day, after losing her connection to the teleportation sigils in Westruun, Lady Allura scryed across Tal'Dorei, revealing to Vox Machina that eastern towns, including Westruun, had, indeed, been conquered, presumably by Rhyshan and Umbracil.