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Artax
From Warhammer 40k - Lexicanum
Artax was a Librarian in the Tome Keepers Chapter, who first discovered its unique psychic ability known as the Amplification. This occurred on Jagh, between M33-M34, and afterwards all of the Tome Keepers' future Librarians were taught the ability.[1]
Source
- 1: White Dwarf 458, pg. 56 - Index Astartes: Tome Keepers