|Colours:||A sharp, acid green[2a]|
House Wyvorn was a Knight House of the Imperium that later fall to Chaos. It was one of the five Knight Houses of Adrastapol and, like all of the Houses, its Knights took part in the effort to liberate Donatos from a Word Bearers invasion. Disaster struck the Knight Houses of Adrastapol during the battle with the Word Bearers, however, when Wyvorn and House Chimaeros began attacking their fellow Knights, after their Thrones Mechanicums were tainted through Chaos witchery. In the bloody betrayal that followed, High King Tolwyn Tan Draconis was killed and it fell to his son Danial Tan Draconis to rally the remnants of Houses Draconis, Pegasson and Minotos' forces. He successfully did so and then launched an attack that sought vengeance upon both the traitorous Houses and the Word Bearers.
The traitor Knights were wiped out in battle with Danial's forces and when the newly crowned High King returned to Adrastapol, he ordered a purge of House Wyvorn and Chimaeros. In a long process, that was overseen by the Ministorum, the strongholds of both Houses were destroyed and their Knights were either killed or, if found free of heresy, they were forced to become Freeblades and were banished from the Knight World.
- Archduke Dunkan Tan Wyvorn - Head of the House during the Betrayal on Donatos. Pilot of the Knight Porphyrion Iron God. Killed in the aftermath of the Betrayal on Donatos by Lady Suset Dar Draconis.[2b][2c]
- 1: Codex: Imperial Knights (8th Edition), pg. 53 — A Tapestry of Glories: Betrayal on Donatos
- 2: Kingsblade (Novel)
- 3: Knightsblade (Novel), Chapter 3