Raishan

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

Background
Cerkonos revealed to Keyleth that a young girl named "Raishan" 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. Raishan, 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 Raishan in her humanoid form during Keyleth's Aramente with the Fire Ashari.

Raishan 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 Raishan and Umbrasyl 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 Raishan and Umbrasyl.

For some time after the initial attack, Raishan seemed to disappear, with nobody seeing or hearing anything about her current activities. Jarett Howarth explained to Vox Machina that attempts to scry Raishan's location had been hindered.

Raishan finally reappeared in Whitestone, where she revealed to Vox Machina that she had taken the form of Asum Emring. She proposed an alliance of sorts with Vox Machina, saying that she wanted to take down the Cinder King, Thordak.

Raishan assisted Vox Machina during the battle against Vorugal. After Vex'ahlia dealt a fatal blow to the white dragon, Raishan flew down and tore Vorugal's throat out.

Raishan assisted Vox Machina in the battle against Thordak. After the red dragon was slain, Raishan walked up to his corpse and began casting a spell from a scroll. Vax'ildan then attacked her, having been told by Keyleth not to let the green dragon touch Thordak's corpse. Raishan fled deeper into Thordak's lair. Vax, Vex, and Keyleth chased after her and entered a lava-filled cavern containing five strange crystalline dragon eggs. From her position at the ceiling of the cavern, Raishan cast Meteor Swarm and dealt some heavy damage to the half-elves.

The rest of Vox Machina and their allies made their way down into Thordak's lair to join the fight with Raishan. Scanlan used the flute given to him by J'mon Sa Ord and the brass dragon soon arrived to aid them. During the fight, Raishan dealt heavy damage to Vox Machina, forcing them to focus on healing each other rather than attacking her. Both Vex'ahlia and Scanlan were temporarily killed during the battle. When most of them were laying injured or unconscious on the ground, Raishan took the opportunity to escape, taking two of the dragon eggs with her and teleporting away with Thordak's corpse.

Spells

 * Abi-Dalzim's Horrid Wilting
 * Blight
 * Chain Lightning
 * Cone of Cold
 * Contingency
 * Counterspell
 * Dispel Magic
 * Freedom of Movement
 * Greater Invisibility
 * Haste
 * Melf's Acid Arrow
 * Meteor Swarm
 * Minor Illusion
 * Modify Memory
 * Prismatic Spray
 * Project Image
 * Teleport

Notable Items

 * Unknown scroll ; cast a spell that looked similar to Speak with Dead (used on Thordak's corpse)

Trivia
Raishan 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 ).