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'''Eidolon''' was the first [[Astartes]] personally promoted to the rank of a [[Space Marine Captain|Company Commander]] by [[Fulgrim]], and his rise to the top of the Legion as a Lord Commander was accompanied by the growth of his reputation as a prime example of what it meant to strive to achieve perfection. He was commonly regarded within the Legion as the most proficient of the Lord Commanders, with a combat record that included excellent performance in sieges, holding actions and rapid assaults.{{Fn|1}} Eidolon looked to Fulgrim as a father-figure in a particularly intense way, and was subsequently unfailingly loyal to the [[Primarch]]. This, combined with the personality traits that come with overwhelming arrogance, led to his fall to [[Chaos]] during the [[Horus Heresy]].{{Fn|22a}}

When a Blood Angels force entered conflict with the [[Megarachnid]]s on Murder, a distress signal was sent out.{{Fn|12a}} Eidolon led the Emperor's Children response, but his arrogance led to needless casualties. The Luna Wolves ultimately arrived and saved the Emperor's children, after which captain [[Tarik Torgaddon]] criticized Eidolon in front of his soldiers. Eidolon backed down, but swore to never forget Torgaddon's insult.{{Fn|12b}} Some time after the [[Cleansing of Laeran]], [[Fabius Bile]] experimented on Eidolon and gave him the ability to yell at a destructive level; this ability presented itself during the Battle of Isstvan Extremis.{{Fn|22b}}

*{{Endn|2}}: [[Galaxy In Flames (Novel)]], :**{{Cite Thisendn|2a}}: ch. 2**{{endn|2b}}: ch. 5