He realised that he too was weeping, for he had never expected to witness such a sight, the heavens opening and precipitation falling to the surface of the red planet. Such a thing had not happened in living memory, and on Mars that was a long time.

Two other war machines followed Verticorda, his brothers-in-arms and fellow Knights of Taranis. He could hear their chatter over the Manifold, the synaptic congress that linked their minds, but had not the words to convey his own sense of wonder at the sight that greeted them on this day of days.

The sky above Olympus Mons raged.

Billowing storm clouds heaved as though ancient, forgotten gods battled within them, slamming their mighty hammers against wrought iron anvils and hurling forked bolts of lightning at one another. Mars's largest moon, Phobos, was visible as a yellowed irregularity behind in the clouds, its cratered surface at its closest point to the surface of Mars in decades.

The mighty volcano, the largest mountain in the Tharsis region and indeed the solar system, soared above the Martian landscape, the dizzyingly high escarpments of its cliffs rising to almost thirty kilometres above the surface of the planet. Verticorda knew this region of Tharsis intimately; he had marched Ares Lictor from the Fabricator General's forge on the eastern flanks of the mighty volcano three decades ago, and he had led his brother warriors across its slopes uncounted times.

More lightning flashed and the thousands gathering at the base of the volcano gazed fearfully into the building tempest from towering hab-stacks and ironclad bulwarks of Kelbor-Hal's domain. Abused skies cracked and roared, distorting under the overpressure of something unimaginably vast, and the atmospherics lit up the sky as far as any eye, fleshy or augmetic, could see.

Crowds in their thousands, their tens of thousands, were following the Knights up the slopes of Olympus Mons, but they had not the speed or manoeuvrability of the war machines. This wonder was for the Knights of Taranis and for them alone.

A shape moved in the clouds, and Verticorda halted his mount at the sheer edge of the caldera's escarpment with a release of pressure on his right hand. The machine reacted instantly. The bond he had forged with it in years of battle was that of two comrades-in-arms who had shared blood and victory in equal measure.

Verticorda could feel the anticipation of this moment in every sizzling joint and weld within Ares Lictor, as though it - more than he - was anticipating the glory of this day. Golden light flashed above and the drizzle of rain became a downpour.

A zigzagging pathway had been cut into the cliff, leading to the base of the caldera, nearly two kilometres below. It was a treacherous path in ideal conditions, but in this deluge it was close to suicide.

'What do you say, old friend?' asked Verticorda. 'Shall we greet these new arrivals?'

He could feel the machine straining beneath him and smiled, easing up the power and walking the Knight towards the edge of the cliff. The steps were designed for the long strides and wide treads of a Knight, but were slick and reflective with rain. It was a long way down and not even the armour or energy shields that protected a Knight in battle would save him from a fall from this height.

Verticorda guided Ares Lictor's first step onto the cut path and felt the slipperiness beneath its feet as though he walked upon it himself. Each step was dangerous and he took care to ensure that each one was taken with the utmost reverence. Step by step, inch by inch, he walked Ares Lictor down the path to the cratered plain below.

Golden light suddenly burst from the clouds above, dazzling and brilliant, and bolts of scarlet lightning danced like crackling spider webs between the ground and sky. Verticorda almost lost his footing as he instinctively looked up.

A mighty floating city of gold was descending from the heavens.

Like a mountainous spire sheared from the side of some vast, continental landmass, the city was studded with light and colour, its dimensions enormous beyond imagining. A vast, eagle-winged prow of gold marked one end of the floating city, and colossal battlements, like the highest towers of the mightiest Martian spire, rose like gnarled stalagmites from the other.

Rippling engines flared with unimaginable power on the colossal edifice's underside, and Verticorda stood amazed at the technology required to prevent such a monstrous creation from plummeting to the ground. Flocks of smaller craft attended the larger one, its dimensions only growing larger the more it emerged from its concealing clouds.

'Blood of the Machine,' hissed Yelsic, rider of the Knight at his back. 'How can such a thing stay aloft?'

'Concentrate on your descent,' warned Verticorda. 'I don't want you losing your footing behind me.'

'Understood.'

Verticorda returned his attention to the pathway, negotiating the last three hundred metres bathed in a cold sweat. He let out a long, shuddering breath as he took his first step onto the surface of the Olympus Mons caldera, enjoying the strange new sensation of mud sucking at his feet.

By the time the Knights reached the base of the cliff, the enormous craft had landed, its gargantuan bulk surely offset by some dampening field to prevent it from collapsing under its own weight, or sinking deep into the Martian surface. Roiling clouds of superheated steam and condensing gases billowed outwards from the ship and as they swept over Ares Lictor, Verticorda smelled the scents of another world: hard radiation, the ache of homelands long forgotten and thin, achingly cold, mountain air.

He told himself it was ludicrous to sense such things from a ship that had just made the fiery descent through a planet's atmosphere, yet they were there as plain as day.

'Spread out,' said Verticorda. 'Flank speed.'

The Knights loping alongside him moved into a combat spread as they strode through the hot, moist mists. Verticorda felt no threat from the unknown craft, yet decades of training and discipline would not allow him to approach it without taking precautions.

At last the mist thinned and Verticorda pulled up as the enormous golden cliff of the vessel's flanks rose up before him like a mountain freshly deposited on the planet's surface. Its scale was awe-inspiring, more so than even the fastnesses of the Titan legions or the data mountains of the Temple of All Knowledge.

Even the mightiest forge temple of Mondus Gamma on the Syria Planum paled in comparison to the scale of this vessel, for it had been fashioned with deliberate artifice and not the combined forces of millions of years of geological interaction. Every plate and sheet of the enormous vessel was worked with the care of a craftsman, and Verticorda struggled to think of a reason why so many would labour for so long and with such devotion to ornament a vessel designed for travel between the stars.

The answer came a moment after the question.

This was no ordinary vessel, this was a craft built with love, a craft built for a being beloved by all. No ordinary man could inspire such devotion and Verticorda suddenly felt an overwhelming fear that he was in the presence of something far greater and far more terrifying than anything he could ever have imagined.

A shrieking blast of steam vented from the ship and a colossal hatchway was limned in golden light. Huge pneumatic pistons - larger than a Titan - slowly lowered a long ramp, easily wide enough for a regiment of gene-bulked Skitarii to march down in line abreast. The ramp lowered with no sign of strain on the vessel, and the brightness within poured out, bathing the Martian landscape in a warm, welcome glow.

Verticorda twisted Ares Lictor around on its central axis, and felt a shiver travel the length of his spine as he saw the entire rim of the volcano's crater lined with onlookers. With a thought, he increased the magnification through the viewscreen and saw thousands of robed adepts, menials, tech-priests, logi and workers gathered to watch the events unfolding below.