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'''Aethon Shaan''' was [[Space Marine Captain|Shadow Captain]] of the [[Raven Guard]]'s Fourth Company in 999.[[M41]]^{{Fn|1a}}.

When the [[Chaos]] army known as the [[Bloodborn]] invaded [[Ultramar]] in 854999.[[M41]]^{{Fn|2a}}, the Raven Guard's [[Master of Shadows]] sent Shaan and one of the Fourth Company's elite squads to assist the [[Ultramarines]]. Their specific mission was to capture [[Ardaric Vaanes]], a renegade Raven Guard who had been seen traveling in the retinue of [[Warsmith]] [[Honsou]]^{{Fn|1a}}.

Vaanes and his squad infiltrated the Chaos-held city of [[Axum]] on [[Tarentus]] and neutralized the sentries, allowing an Ultramarines strike force to enter and demolish the defenses. However, Axum was a trap laid by Honsou for [[Uriel Ventris]], who only just managed to evacuate his troops before the city was leveled from orbit. During the evacuation, Shaan saved Scout Sergeant [[Issam]]'s life by casually beheading a persistent [[Khorne Berserker]] clinging to their escaping [[Thunderhawk]]^{{Fn|1b}}.

Shaan later joined Uriel and the Ultramarines Fourth Company in defending [[Calth]] from the assault of the [[Iron Warriors]], and helped [[Inquisitor]] [[Namira Suzaku]] to interrogate Vaanes after he was captured during the fight at [[Guilliman's Gate]]^{{Fn|1c}}.

Shaan and his squad were instrumental in turning the tide on Calth, when they infiltrated the Chaos force's command vehicle, the [[Black Basilica]], and destroyed it with demolition charges. This not only killed a fair number of the Chaos soldiers, it also halted the corrupt [[Adept]] [[Cycerin]]'s attempts to take control of the [[Praetorian]]s fighting on the Ultramarines' side^{{{Fn|1d, }}{{Fn|1e}}}.

In the climax of the battle on Calth, Shaan accompanied Uriel and his [[Command Squad]] through the caverns to the underground tomb of [[Remus Ventanus]], the saviour of Calth^{{{Fn|1f, }}{{Fn|1g, }}{{Fn|1h}}}. Shaan lost several men in the fight with Honsou's warriors, but survived the fight, and the collapsing of the cave by Honsou^{{Fn|1i}}.

Afterwards, Shaan was bewildered by the actions of Vaanes, who had fought for their side in the final battle. Shaan had been ordered to take Vaanes back to the [[Ravenspire]] for punishment, but did not know what he would say now. Uriel suggested that Shaan tell the truth: that Vaanes had given his life fighting against the [[Ruinous Powers]]. Shaan agreed, and asked [[Apothecary]] [[Selenus]] to extract Vaanes' [[gene-seed]], for return to the Raven Guard's [[fortress-monastery]]^{{Fn|1i}}.

Shaan and his surviving warriors also accompanied the Second and Fourth Companies to [[Talassar]] to relieve the besieged [[First Company]] led by [[Chapter Master]] [[Marneus Calgar|Calgar]], taking part in the [[jump pack]] assault against [[M'kar]]'s [[daemon]] army^{{Fn|1j}}. He and his surviving warriors were among the few non-Ultramaries to attend the Chapter's victory celebration in the [[Shrine of Guilliman]] on [[Macragge]], and the fallen Raven Guard were honoured along with the Ultramarines^{{Fn|1j}}.

*''"The way into Axum is clear, Sergeant Issam. Your approach was made with great skill, but this is Raven Guard work."''^{{Fn|1b}}

*^{{Fn|1}}[[The Chapter's Due (Novel)]] by [[Graham McNeill]]:**a{{Endn|1a}}: Chapter 3, pp. 38-46**b{{Endn|1b}}: Chapter 4, pp. 49-59**c{{Endn|1c}}: Chapter 12, p. 166**d{{Endn|1d}}: Chapter 16, pp. 213-216**e{{Endn|1e}}: Chapter 17, pp. 221-229**f{{Endn|1f}}: Chapter 19, pp. 252-258**g{{Endn|1g}}: Chapter 20, pp. 271**h{{Endn|1h}}: Chapter 21, p. 281**i{{Endn|1i}}: Chapter 22, pp. 294-295**j{{Endn|1j}}: Chapter 24, pp. 311-317*^{{Fn|2}}[[Codex: Space Marines (5th Edition)]]**a{{Endn|2a}}: p. 40