The Fourth Legion -

The loyalist commander lay broken. Valerius looked down, his helmet displaying endless data streams of heat signatures and structural failures. He didn't feel pride—only the bitter resignation of his Legion's existence. They were the architects of devastation, the ones the Emperor used for the "dirty work", and now, they were the bringers of that same bitter justice to their own brothers.

When Valerius finally stepped into the command center of the fortress, he did not find a desperate garrison. He found a masterpiece of engineering, now ruined by his own superior engineering. The Fourth Legion

The planet of Tallarn was already a ruined landscape, but the city of still held, defended by the loyalist Imperial Fists. To the Iron Warriors, the IVth Legion, this wasn't just a tactical goal; it was a personal insult. The loyalist commander lay broken

Warsmith Valerius stood on a ridge overlooking the shining white walls of the fortress. Behind him, thousands of his Legionaries—armored in hazard-striped iron—silently checked their ordnance. There was no shouting, no bloodlust, only the cold, systematic preparation of war. The Iron Warriors did not fight for glory; they fought for the sake of breaking what others deemed unbreakable. They were the architects of devastation, the ones

The Iron Warriors (IVth Legion) are known for being master siege-breakers, pragmatic yet bitter warriors who specialized in breaking down static defenses, often in competition with the Imperial Fists.*

"They have had eighteen months to fortify this position," whispered his second-in-command, Berossus, over the vox-channel.

"Iron Without!" roared his Legionaries as they advanced, not running, but walking in a relentless, iron wall. The Imperial Fists fired from the breaches, but the IVth Legion simply ignored the casualties. They were used to taking suicide missions, forced by their primarch, Perturabo, to excel in hopeless situations.