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The '''{{PAGENAME}}''' is a red [[Ultramarines]] [[power armour]] helmet that contains within it the complete didactic works of [[Space Marine Sergeant|Sergeant]] [[Aeonid Thiel]]. They detail the results of his pre-[[Horus Heresy]] studies, outlining the optimal methods by which an [[Adeptus Astartes]] could kill a fellow [[Battle Brother]]; which had originally led Thiel to be censured by his Legion for treason. Ten thousand years later though, the Sergeant's works are still without equal.{{Fn|1}}{{Fn|2}}