Long before his resurrection, Lord Guilliman, the Avenging Son and Primarch of the Ultramarines, foresaw a time when the Adeptus Astartes would no longer be enough to stem the flow of mankind's enemies.

With the aid of Archmagos Belisarius Cawl, the Primaris Marines were created, an improvement on the Emperor's original design.

In an attempt to improve the existing Firstborn marines, Cawl created the Rubicon Primaris, a revolutionary surgery that would further enhance Astartes. However, this procedure was not without risk...

Marneus Calgar, Chapter Master of the Ultramarines, who, in an unparalleled demonstration of leadership and courage, was the first of the Firstborn Marines to undergo this daunting procedure.

His successful transformation inspired his brothers, bridging the divide between the Firstborn and the Primaris Marines and reinforcing the Ultramarines' place at the forefront of the Imperium's defenders.

00:00 Avenging Son
02:30 The Rubicon Primaris
06:09 Marneus Calgar



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