The noise was horrendous. Messinius’ audio dampers were at maximum and still the roar of ordnance stung his ears. Those humans that survived today would be rendered deaf. But he would have welcomed more guns, and louder still, for all the defensive fury of the assailed palace could not drown out the hideous noise of the daemons – their sighing hisses, a billion serpents strong, and chittering, screaming wails. It was not only heard but sensed within the soul, the realms of spirit and of matter were so intertwined. Messinius’ being would be forever stained by it.

Tactical information scrolled down his helmplate, near environs only. He had little strategic overview of the situation. The vox-channels were choked with a hellish screaming that made communication impossible. The noosphere was disrupted by etheric backwash spilling from the immaterial rifts the daemons poured through. Messinius was used to operating on his own. Small-scale, surgical actions were the way of the Adeptus Astartes, but in a battle of this scale, a lack of central coordination would lead inevitably to defeat. This was not like the first Siege, where his kind had fought in Legions.

He called up a company-wide vox-cast and spoke to his warriors. They were not his Chapter-kin, but they would listen. The primarch himself had commanded that they do so.

‘Reinforce the mortals,’ he said. ‘Their morale is wavering. Position yourselves every fifty yards. Cover the whole of the south-facing front. Let them see you.’ He directed his warriors by chopping at the air with his left hand. His right, bearing an inactive power fist, hung heavily at his side. ‘Assault Squad Antiocles, back forty yards, single firing line. Prepare to engage enemy breakthroughs only on my mark. Devastators, split to demi-squads and take up high ground, sergeant and sub-squad prime’s discretion as to positioning and target. Remember our objective, heavy infliction of casualties. We kill as many as we can, we retreat, then hold at the Penitent’s Arch until further notice. Command squad, with me.’

Command squad was too grand a title for the mismatched crew Messinius had gathered around himself. His own officers were light years away, if they still lived.

‘Doveskamor, Tidominus,’ he said to the two Aurora Marines with him. ‘Take the left.’

‘Yes, captain,’ they voxed, and jogged away, their green armour glinting orange in the hell-light of the invasion.

The rest of his scratch squad was comprised of a communications specialist from the Death Spectres, an Omega Marine with a penchant for plasma weaponry, and a Raptor holding an ancient standard he’d taken from a dusty display.

‘Why did you take that, Brother Kryvesh?’ Messinius asked, as they moved forward.

‘The palace is full of such relics,’ said the Raptor. ‘It seems only right to put them to use. No one else wanted it.’

Messinius stared at him.

‘What? If the gate falls, we’ll have more to worry about than my minor indiscretion. It’ll be good for morale.’