The holo-image of the First Lieutenant of the Templars did not move. Unhelmed, his face was a single twisted scar, and if there was any emotion beyond cold fury behind his eyes, Sigismund could not see it. Boreas’ sword of office stood almost as tall as he did, its guard the cross of the Templars, its blade etched with the names of the dead.

‘All ships, stand by,’ said Sigismund softly, and heard the orders ripple out.

The vibration in the deck rose in pitch. The dull ache that had been building in his skull for the last hours was sharpening. He noticed one of the human deck crew shiver and wipe a hand across a bead of blood forming in her nose.

‘Hold to our oaths and the strength of our purpose,’ he called.

Whispers buzzed at the edge of his thoughts, razor tips scratching over metal. They had needed to sedate every astropath in the fleet two hours before, as a wave of psychic pressure had sent them babbling and screaming. It had become more intense with every passing moment, and it presaged one thing: it was the bow wave of a truly vast armada coming through the warp, bearing down on the Solar System like a storm front. Horus and the traitors were coming.

‘Etheric surge detected!’ shouted a sensor officer.

‘Here it comes,’ said Rann, and brought his fist to his chest. ‘Honour and death.’

‘For the primarch and Terra,’ said Boreas.

‘For our oaths,’ said Sigismund. The images of his two brothers blinked out.

He reached down and pulled his own helm from his belt and locked it in place over his head. ‘May my strength be equal to this moment,’ he said to himself as the helm display lit in his eyes. The data of the battle sphere overlaid his sight.

The Plutonian Gulf glittered with weapon platforms, torpedo shoals and mine drifts. Together they formed a great web, tens of thousands of kilometres deep, stretching from the very edge of night to the orbits of Pluto itself. Ships glinted amongst the defences: fast gun-sloops and monitor ships that were little more than engines and weaponry. They had been built in the orbital forges of Luna, Jupiter and Uranus and dragged to the edge of the sun’s light. Alongside them lay the fleet of the First Sphere: hundreds of warships, all in motion. And beyond the warships, the moons of Pluto waited. Studded with weapons and hollow with tunnels, each was a fortress that could have stood against a fleet.

The sheet of stars erupted with lightning. Rents opened in the vacuum. Nauseating colours and dazzling light poured out as ship after ship surged from nothing into being. Tens, and then hundreds. The sensor servitors in the Lachrymae twitched and gabbled as targets multiplied faster than they could vocalise updates.