‘Too much blood has been shed on my behalf. I will not shy from this fight,’ Guilliman said, and his tone would brook no disagreement. ‘There can be no retreat until the Pride of the Emperor is crippled. I must face my brother and occupy him while these tasks are done. And if I must fight him, I will kill him, or I will die in the attempt. I cannot let him escape unpunished again. My sons,’ he added, his voice softening, ‘it is the only way to escape this trap.’

Andros bowed his helmeted head. Thiel paused a moment, uncertain, before doing the same. Sure of their agreement, Guilliman took his own helm from a grav-platform pushed by two mortal men. He mounted the teleport platform – stepping directly onto it with no need of the steps that led from the deck – and turned to address his sons.

‘Now, my warriors, let us show my brother the consequences of turning upon the Imperium of Terra!’

‘We march for Macragge!’ they bellowed, and their combined voices were enough to drown out the thunder of battle.

Guilliman’s Invictus Suzerain guard followed him onto the teleport pad. They formed a protective ring around him, their shields and power axes held up in a shield wall in preparation for teleportation directly into the jaws of battle.

To those around him, Guilliman was an infallible leader, his abilities supernatural. Even to the rational Ultramarines, who believed the Emperor of Mankind to be a man and not a god, and likewise His primarch sons, a sense of near-religious awe had crept into their attitude towards him. It had only become more pronounced since the last days of the Heresy.

But Roboute Guilliman was not infallible.

He knew this course of action to be fraught with risk. Andros had been right to raise the possibility of defeat. The primarch only wished he could praise his son for his insight rather than dismissing his concerns. His campaign against the Emperor’s Children had, to all purposes, failed. Fulgrim had the initiative. Guilliman’s choices had been made for him. The pieces were set on the board, there was only one option: they had to withdraw.

Currently, withdrawal was impossible. If the Gauntlet of Power broke off from the fight, then the Pride of the Emperor would inflict massive damage upon the battle-barge. Fulgrim would then most likely attempt a boarding assault of his own once their defences were shattered. Guilliman could not allow his brother to do that at a time of his choosing.