"You are like a son and together we have all but conquered the galaxy. Now the time has come for me to retire to Terra. My work as a soldier is done and now passes to you for I have great tasks to perform in my earthly sanctum. I name you Warmaster and from this day forth all of my armies and generals shall take orders from you as if the words cam from mine own mouth. But words of caution I have for you for your brother Primarchs are strong of will, of though and of action. Do not seek to change them, but use their particular strengths well. You have much work to do for there are still many words to liberate, many peoples to rescue. My trust is with you. Hail Horus! Hail the Warmaster!"
The Emperor of Mankind
The Warmaster Horus here depicted at his triumph at Ullanor.
Horus is armed and armoured in his traditional battle-dress wielding Worldbreaker and the distinctive Talon. The few historical documents that survive (and are accessible beyond an Ordo Extremis clearance) contradict each other as to the equipment the Primarch of the XVI vaunted legion during the campaign. It is likely due to the ferocity of the Ork that Horus was forced to use several weapon lay outs depending on malfunction, destruction or tactical proclivities of any given battle.
Horus Stands atop a tortured ground, saturated in the blood of his Ork foes in the closing stages of the campaign. Spears litter the gound, with an imperial flag impaled upon one of them. The faded Imperial Eagle upon a crismon field stares defiant and unbroken beneath the heel of the Emperor's most favoured child.
The pitted pearl armour of the Primarch holds the emblematic Eye of Horus at it's centre. The eye of Terra was a common device used throughout the Imperium, favoured by the Astrates and Primarchs themselves as a link to their spiritual gene-sire; The Emperor. It has many interpretive meanings; for some it is a symbol of justice, others the unwavering knowledge of the Emperor pervading the void. Horus is most commonly associated with this fetish being the first of the Primarch's to be re-united with his father, a fetish that he would drag into the Heresy and corrupt forever-more as a symbol for treachery, betrayal and Heresy.
The below images were used as a basis for the conversion work as very little official art exists of Horus before the Heresy took root. I don't know who the artists are (please contact me if you know, i'd like to credit them) but they were invaluable in creating this miniature.
More images with a sepia background.