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'''Dio Promus{{PAGENAME}}''' was the [[Chief Librarian]] of the [[Ultramarines]] during the [[Great Crusade]]. He voted in favor of a Legion [[Librarius]] during the [[Council of Nikaea]].{{Fn|1}} He later was recruited into the [[Knights-Errant]].{{Fn|22b}}

As a member of the Knights-Errant, Promus was tasked with Malcador to select Candidates for the [[Grey Knights|Titan Project]], killing those who were seen as too mentally weak.{{Fn|22b}} Promus went on to lead a mission at the orders of Malcador to recover the [[Shards of Magnus]]. Accompanied by [[Yasu Nagasena]] and [[Space Wolves]] led by [[Bodvar Bjarki]], their mission brought them to [[Kamiti Sona]], [[Aghoru]], and finally [[Nikaea]] against the [[Thousand Sons]] Cabal of [[Ahriman]].{{Fn|2a}} On Nikaea was struck down trying to fight a shard of [[Magnus]] on [[Nikaea]], blasted by Magnus's power, but [[Yasu Nagasena]] stepped in to protect him from a warm of [[daemons]]. After the shards of Magnus merged and left for the [[Planet of Sorcerers]], Promus was confronted by Bjarki who learned of his past murders of loyalist Legionaries from [[Fateweaver|Fatewoven]]. Promus admitted the daemon's claims were true to Bjarki but refused to explain the secrets he was bound to keep. On the orders of Bjarki [[Svafnir Rackwulf]] ended his life in response. His friend [[Lemuel Gaumon]] then took his name as his own.{{fn|2a}}

*{{Endn|2}}: [[The Crimson King (Novel)]], Chapter 7**{{Endn|2a}}: [[The Crimson King (Novel)]] Chapters 19–23**{{Endn|2b}}: Chapter 7