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The '''Brethren Esoteric''' are a [[Space Marine Chapter]].{{Fn|1b1}}

They are among the [[Space Marine Chapter]]s, that have formed alliances with [[Rogue Trader House]]s. The Brethren Esoteric have a millennia-long accord with [[House Phalomor]], though, the exact arrangements between them is unknown. Some of the Chapter's forces did serve as an [[Honor Guard]] for the House's leader, [[Eyva Phalomor]], when she took part in the [[Octarius War]] in [[M42]].{{Fn|1b1}}

*[[Octarius War]]{{Fn|1a}}{{Fn|1b1}} **[[Forge World]] [[Sigma-Ulstari]]{{Fn|1a}}{{Fn|1b1}}

*{{Endn|1}}: [[War Zone Octarius - Book 2: Critical Mass]] **{{Endn|1a}}: pgs. 14-17 - ''Stand at Sigma-Ulstari''**{{Endn|1b}}: , pg. 30 - ''Classified Document: Forces of the Rogue Trader Eyva Phalomor''