The Rubicon

The Rubicon is the name of the period in the history of the annals of the Storm Angels Space Marine Chapter, when they willingly put themselves at risk by undergoing the dangerous process to step over the Rubicon Primaris to become genetically superior Primaris Space Marines, in order to be more effective in bringing the wrath of the Great Angel to the enemies of Mankind.

Background
Death and Rebirth came to the Storm Angels after the end of the Indomitus Crusade. Self-inflicted losses numbered in the hundreds, but out of the 700 or so brothers who crossed the Rubicon, 400 rose as Primaris, adding their newfound strength of the Chapter, allowing it to change and evolve as it should, to better protect the Imperium. The fury of the Storm Angels was not abated by such weakening; and the five hundred Brothers who survived have acted as one to purge the Ghoul Stars from any threat they could find.

The Rubicon campaigns have seen them fight the same monsters who cursed them during the Long Dark, but the might of the Primaris more than compensated their diminished numbers, and for the first time in more than a century, the Storm Angels were on the offensive, not only defending but reconquering world after world, driving back the insidious threats of the aliens, the traitors and the heretics. As of now, the Chapter is slowly growing back its manpower, and preparing for whatever new danger may arise in those darkened times.