Editing History of the Green Men (section)

===A new purpose===
{{Main|The Great Sowing}}
This crushing defeat at the hands of his arch-rival almost broke Galen. His ambitious plan had been thwarted before it could even begin, his formidable warband was in shambles, all ties to his Legion had been firmly severed. All that was left for him to do was to tremble in fear in his treepalace on Arboria, waiting for his Primarch to find him and punish him for his insolence. To take his mind off these grim matters, he participated in the Legionary Wars, although he had nothing to gain, captured several minor planets and rebuilt their biospheres to suit his twisted taste, created scores of nightmarish plant creatures and tortured countless captives to death in his laboratory. But while he was forgetting the nature of his new home, its true masters did not forget about their new tenant at all. 

As he was plunging deeper and deeper into the recesses of insanity, voices started appearing in his head. First quiet and gentle, akin to mere fleeting thoughts, they gradually grew in confidence and eventually turned into a vile chorus of whispering. They all spoke in different tones and volumes, yet their message was always the same. They whispered that a great visionary like Galen did not deserve such a fate, that his genius was a gift to the Galaxy that he had no right of throwing away. The voices told Galen that he could still make his dream a reality, if only he had strong partners by his side. Forces that always helped the bold and the daring, forces that constantly strove to tear down the obsolete status quo and change the world for the better.

Completely insane, Galen did not recognise these voices as belonging to the creatures who corrupted Sachs and Vrach, and, honestly, he no longer cared. He was offered a second chance to make his dream of complete rebuilding of all life in the Galaxy come true, and he was ready to do anything not to let it slip this time. The voices told him that he needed to prove his worth before he could hope for their assistance, prove that they wouldn't be wasting their time on him. And Galen set about devising a diabolical plan that would forever put his name in the annals of history, a campaign of pure terror which would show everyone the true extent of his capabilities once and for all.

He set his mind on the Durnovarian Subsector, Sector Victrix, Segmentum Obscurus. Its relative proximity to his base in the Eye of Terror certainly played an important role, but it was hardly the main reason behind Galen's decision. This subsector filled with numerous Forge Worlds and Mining Worlds had long since won the fame of the Steel Heart of Victrix. The colossal factories of its worlds were constantly busy producing equipment of all kinds and purposes for the whole Segmentum as well as great clouds of soot and rivers of industrial sludge for their own poor planets. It was, therefore, little wonder that hardly any of the subsector's inhabited planets could sustain any kind of life. This place was the antithesis of everything Galen stood for, and so he decided to make a grim example out of it to show what happens to the fools who arrogantly deem themselves the masters of Nature. With these considerations in mind, the Green Men embarked on their wicked crusade against the industry.

Few educated people in today's Imperium don't know about the dreaded Great Sowing; its unspeakable horrors and unimaginable atrocities have since become textbook examples of the inhuman cruelty of the Traitor Legions. The merciless Green Men subjected all of the worlds they could lay their hands on to a biospherical reconstruction with all their inhabitants still trapped on the surface; but this was probably the best fate one caught in the Durnovarian Subsector during the Great Sowing could hope for. Even after the millennia that have passed, the descriptions of the perversely imaginative deaths the vile plantmen put their prisoners to could turn one's hair grey. Worse still, forces of the Imperium failed completely to stop this madness. An entire Successor Chapter was completely obliterated there, the first one to perish such since the Second Founding, and another one was crippled and later disbanded. Only the belated interference of the Silver Cataphracts could put an end to this horror, but by that time it had been far too late: every single inhabited world in the subsector had been turned into a verdant hell that could only be purged by a viral bombing. The Durnovarian Subsector was declared lost to the Imperium, and its demise delivered a massive blow to the defensive capacity of Segmentum Obscurus.