To his immediate left towered the mighty Warlord Tharsis Hastatus, under Princeps Suzak, while further out was Princeps Mordant's Reaver, Arcadia Fortis, with the dashing Princeps Basek's Warhound, Vulpus Rex, in support.
Once again, Cavalerio acknowledged his warriors as they took up position in the ruins of the outer sub-hives.
'All princeps, Manifold conference,' he said.
One by one, the flickering images of his brother princeps appeared before Cavalerio and he was gratified to see only the hunger for battle in their faces. Each was eager to take the fight to Mortis, despite there only being one possible outcome to the battle. For a moment he wished he still fought as they did. Then, he smiled at the foolishness of such a desire, for who could not wish to be as connected to such a mighty engine as Deus Tempestus in such a complete and total manner as he was.
'Brothers, this is the most dreadful and most glorious moment of our lives,' he said. 'I'm not normally given to sentiment, but if the day of our deaths doesn't warrant a little melodrama, then I don't know what does.'
Cavalerio saw a few wry smiles and said, 'The credo of Tempestus is that the manner of our deaths is at least as important as the manner of our lives. Today we will show these Mortis dogs what it means to feel the wrath of our Legio. It has been an honour to fight alongside you all over the years, and it is a privilege to lead you in this last march. May the light of the Omnissiah guide you.'
His brothers solemnly acknowledged his words with binaric glows of pride, but it was left to Princeps Kasim to give fleshvoice to the feelings of the Legio.
'The honour is ours, Stormlord,' said Kasim.
Cavalerio smiled as he saw the gleam of the gold skull and cog medallion he had given the man after the Epsiloid Binary Cluster wars.
'Good hunting, everyone,' said Cavalerio, and closed the link.
Despite their blooding in the initial fighting around the Magma City, Princeps Camulos could not ignore such a blatant challenge, and Cavalerio's auspex filled with returns as Legio Mortis marched through the smoke and fire to meet them. Swarming around each engine were thousands of Mortis skitarii, fearsome, skull-visaged warriors of terrible reputation.
The Tempestus skitarii, led by the indomitable Zem Aeschman, the scarred hero of Nemzal Reach, marched out to meet them, outnumbered at least four to one. To go into an engine fight required great courage, but to march into battle beneath such a titanic conflict demanded fearlessness only such enhanced warriors could boast.
'Multiple engine signatures,' said Sensori Palus, and Cavalerio acknowledged the inload, putting Aeschman's skitarii from his mind. The gargantuan form of Aquila Ignis led the Mortis engines, a row of three twisted Warlords marching in front of it like a skirmish screen. On both flanks, two Reavers circled wide.
'They only outnumber us by one engine,' said Cavalerio. 'That's not so bad, eh?'
'Yes, my princeps,' said Moderati Kuyper. 'It's just a shame they outgun us so heavily.'
Watching the Mortis deployment, Cavalerio said, 'They're being cautious. None of them dare stray too far from their big brother.'
'And who can blame them?'
'They're afraid of us,' said Cavalerio. 'They're still thinking of what we did to them in the opening ambush and they're scared we've got another trick like that up our sleeves.'
'I wish we did, Stormlord,' muttered Kuyper.
Cavalerio smiled in his amniotic tank, a stream of bubbles rising from his mouth.
'Who says I haven't?' he asked. 'All princeps, marching speed.'
On the far side of the Magma City, where screaming mobs of skitarii and altered Protectors threw themselves at the Vulkan Gate, a blizzard of gunfire and artillery laid waste to the attackers closest to the entrance. Before Melgator's forces could regroup and resume their attack, the Vulkan Gate opened and beneath their azure lightning wheel standard, the Knights of Taranis rode out.
Lord Verticorda led his Knights, the noble form of Ares Lictor resplendent, the wound in its chest repaired in time for this last ride to glory. Alongside Verticorda, Lord Caturix rode the majestic Gladius Fulmen, his war engine proudly bearing the scars and ravages of battle on its burnished plates.
Behind them came the last nine Knights of the order, their armour polished and repaired such that they shone like new. This was to be their final charge and the Magma City's artificers had ensured that they would make a fine sight as they rode out.
The Knights formed a wedge, with Verticorda and Caturix as the tip of the spear, and plunged into the mass of enemy warriors, their guns spitting death with every shot. The combined shock of the artillery strike followed by the assault of the Knights broke the front of the Dark Mechanicum line, and the Knights smashed through the reeling survivors like giants scattering children before them.
Roaring streams of turbo lasers and blitzing storms of explosive shells tore through skitarii and weaponised servitors as the Knights carved a path along the Typhon Causeway. Hundreds of their enemies were dying every second and their bodies were crushed underfoot as the Knights rode ever onwards. The Knights of Taranis slaughtered their way along the causeway's length, Verticorda killing with methodical precision, Caturix with furious abandon.
As sudden as the attack was, Melgator's forces rallied with commendable speed, and armoured units raced to meet the charging Knights. Heedless of their own warriors, enemy cannon opened fire on the causeway, blowing wide craters in the great road. The speed and ferocity of their charge carried the Knights clear of the bulk of the fire, but two warriors, tangled up in the debris of their carnage, were caught by the full fury of a sustained salvo of high explosives and blown to pieces.
Another Knight took a direct hit from an experimental gun recovered from the ruins of Adept Ulterimus's tomb beneath the Zephyria Tholus. Empowered with dark energies from the Vaults of Moravec, a beam of black light punched straight through the Knight's power field to wreath the machine in dark fire that instantly melted through its armour. Verticorda could hear its agonised screams over the Manifold and watched as its dying rider swept a host of enemy warriors to their doom as it plunged from the causeway and into the magma.
With every passing moment, the Knights of Taranis were fighting their way further and further from the Magma City, killing and crushing Adept Zeth's enemies with consummate skill and grace. This was no undisciplined, feral charge, but the exquisite skill of noble warriors exercising their killing art in the most sublime manner imaginable.
Already they had travelled more than two kilometres from the gate, leaving a trail of dead and dying enemies in their wake. As another four hundred metres was won, another Knight died, the machine's legs sawn off by Ulterimus's dark weapon and its carapace pounced upon by a cackling tide of mutant skitarii.
Lord Caturix turned his guns on the swarming skitarii, clearing them from the downed Knight in a series of devastating bursts of gunfire. The Knight was already dead, and, rather than allow the enemy to scavenge from its corpse, Caturix kept firing until its reactor core was breached and it vanished in a seething wall of plasma fire.
Only five Knights remained with Verticorda and Caturix, and as devastating as their charge had proven, it was slowing. More and more enemy warriors were clogging the causeway with their bodies, and entire regiments of artillery and armour were concentrating their fire on stopping the Knights.
Verticorda and Caturix, warriors of wildly different temper yet identical courage, kept pushing onwards, their ultimate goal in sight: the black pavilion of Ambassador Melgator.
Princeps Kasim in Raptoria darted through the ruins of the Arsia sub-silos to unleash a furious barrage into one of the flanking Reavers. The towering engine's shields soaked up the fire of the smaller war machine, turning its guns on the tumbled metallic ruins.