Valdar Aurikon was a Grand Master of the Grey Knights Chapter. He led the Third Brotherhood as Warden of the Librarius, in effect acting as the Chapter's Chief Librarian (in that he has command and control of the Librarius). The Chapter does maintain a Chief Librarian, although he is not named.
In late M41, Aurikon and his Brotherhood came to the aid of the Space Wolves Chapter, when the Daemon Prince Magnus led an invasion of their Homeworld Fenris. However, he was later killed by Magnus, after the Daemon Prince caught the Grandmaster's psychic lightning and hurled it back at him, causing Aurikon's body to turn into nuggets of fool's gold.
- 1: Codex: Grey Knights (7th Edition), pg 15
- 2: War Zone Fenris: Wrath of Magnus, Chapter 3 - Magnus Ascendant
- 3: Codex: Grey Knights (8th Edition), pg.101