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Esoterist
From Warhammer 40k - Lexicanum
Esoterists were a specialzied type of Space Marine used within the Legiones Astartes during the later stages of the Horus Heresy. They were members of the Librarius who returned to their studies with or without the blessing of their Primarch and delved into forbidden lore that saw common use on the battlefield.[1]
Sources
- 1: The Horus Heresy Book Eight, pg. 290