He rolled around the corner and fired two shots from his bolt pistol. The heavy crack-thump of bolter ammunition was reassuringly loud compared to the aliens' weaponry. A pair of aliens fell, their chests blown open by the mass-reactive shells as Uriel flipped both frags down the corridor. He fired twice more before diving back into cover as the grenades detonated simultaneously, hurling bodies through the air in the fiery blast.

Uriel leapt to his feet and dragged Pasanius upright.

'You ready for this, old friend?'

'More than ever, captain,' assured Pasanius hefting the flamer.

Uriel nodded and spun around the corridor, bolt pistol extended before him.

'For the Emperor!'

The Ultramarines followed Uriel as he pounded towards a crimson door, embossed with intricate designs of curving spikes and blades. Even from here he saw it was heavily armoured.

Cross-corridors bisected this one and Uriel could hear the sounds of battle from elsewhere in the ship. Red armoured figures dashed along parallel corridors and he shouted to watch the rear. With so many cross-corridors, there was a very real possibility of being outflanked and surrounded.

He slammed into the door and smashed it from its frame.

Uriel charged through the door, battle-hungry Ultramarines hard on his heels. They entered a vast, high-roofed dome and Uriel grinned with feral anticipation as he realised they must be on the command bridge at last. An ornate viewscreen dominated the far wall, with wide, hangar-like gates to either side. Iron tables with black leather restraint harnesses stood in a line, alongside racks of horrendous, multi-bladed weapons.

In the centre of the chamber, standing atop a raised command dais, was a tall, slender alien wearing an elaborately tooled suit of armour, similar to that of his warriors, but coloured a deep jade. He wore no helmet and his violet-streaked white hair spilled around his shoulders like snow. His skin was a lifeless mask, devoid of expression, and a thin line of blood ran from his lips. He carried a gigantic war axe, its blade stained red.

Dozens of aliens filled the room, heavily armoured warriors, hefting long, halberd-like weapons that pulsed with unnatural energy.

The room reeked of death and terror. How many souls had met their end in this desolate place, wondered Uriel?

He had no time to ponder the question as the wide doors to either side of the viewscreen slid open. A horde of near naked warriors, both male and female, riding bizarre skimming blades and carrying long glaives, swept from each door.

Bolter shots felled half a dozen, but then they were amongst the Ultramarines, slashing and killing with their weapons. Uriel saw Brother Gaius fall, severed at the waist by the bladed wing of one of the flyers. His killer looped overhead as Gaius's body collapsed in a flood of gore.

Uriel put a bolt round through the whooping alien's head, watching with grim satisfaction as his limp body plummeted to the ground. The shrieking blade-skimmers spun high in the air, coming around for another pass.

Bolter rounds exploded amongst them as Dardino and Venasus led their squads into battle. Uriel shot dead another flyer as Venasus moved to stand beside him, his armour slick with alien blood. 'My apologies, captain. It took us five minutes.' Uriel grinned fiercely beneath his helmet. 'I know you'll do better next time, sergeant.'

A skimmer exploded as Pasanius's flamer gouted a vast stream of liquid fire over its rider and fresh gunshots echoed through the dome. The vox in Uriel's helmet crackled to life as the Thunderhawk pilot patched into his personal link.

'Captain Ventris, we will have to pull back soon. The alien vessel is increasing in speed and we will not be able to maintain the umbilical for much longer. I suggest you begin falling back, before I am forced to disengage the docking clamps.'

Uriel cursed. He had no time to acknowledge the pilot's communication as he smashed a leather-harnessed warrior from his sky-board and rammed his sword through his belly. He saw the jade-armoured, albino warrior cutting a path towards him and wrenched his sword clear.

Some shapeless mass writhed around the warrior's legs, but Uriel could not discern its nature in the gloom. A trio of the skimming warriors swooped in towards Uriel. He blasted two from their boards with well-placed bolter fire and beheaded the third. The jade warrior cut down two Ultramarine battle-brothers with contemptuous ease as they tried to intercept him.

Uriel shouted at his warriors to stand fast.

'This one is mine!'

From the icons on his helmet visor, Uriel could see that seven of his men were dead, their runic identifiers cold and black. His breathing was heavy, but his stamina was undiminished.

A space cleared around the two warriors as battle continued to rage throughout the bridge. The shapeless forms around the alien's legs resolved into clarity and Uriel was horrified as he clearly saw the heaving mass of creatures that hissed and spat beside the alien leader. A repulsive, horrifying and piteous agglomeration of thrashing, deformed flesh, sewn together in a riot of anatomies, writhed at the alien's feet. Each one was unique in its nauseating form, but all hissed with the same lunatic malevolence, baring yellowed fangs and jagged talons.

Uriel extended his sword, pointing the tip at the alien leader's chest.

'I am Uriel Ventris of the Ultramarines and I have come to kill you.'

The alien leader cocked his head to one side before speaking. His voice rasped, unused to forming human words.

'You are nothing but a mon-keigh, an animal, and I shall feed you to the excrents.'

Uriel brought his sword back to the guard position as the boiling mass of loathsome creatures surged forwards, their shrieks both terrifying and pitiful. He slashed his sword through the first beast, stinking pus jetting from its soft body as the blade easily sliced through its flesh. He stabbed another, but there were simply too many to kill.

Fangs snapped shut on his calf and Uriel grunted as he felt hot pain lance through him as venom pumped into his bloodstream. His sword hacked the beast's ranged appendage from the mass of its form, splattering him with its internal fluids.

Kesharq stepped forward and swung his axe in a crushing arc, hammering the wide blade into Uriel's chest.

Uriel had seen the blow coming and hurled himself back, robbing the impact of much of its force. He rolled, slashing wide, a terrible screeching from another excreht his reward. He kept rolling as Kesharq's axe hammered into the deck.

He leapt upright parrying another blow from the axe. The impact rang up Uriel's arm, but he could tell that there was little strength behind the blow. This alien was relying on the weight of the axe to do his killing. He thundered his fist into the onyx shaft of the axe and barrelled into the slender alien. The warrior dodged Uriel's shoulder charge, slipping around the Space Marine's side and hammering the weapon into his shoulder.

The blade tore a great gouge from Uriel's armour, skidding upwards and clipping the edge of his helmet. Uriel staggered, dizzy from the impact, but raised his sword in time to parry a lighting reverse cut to his head.

Another of the excrents fastened its jaw upon Uriel's leg. He stamped his armoured boot down on its head, pulping the skull in a mash of bone and brain. Flames licked around him and a shrill screeching and stench of scorched meat filled the air as Pasanius turned his flamer upon the horrific creatures. The pilot's icon on his visor flashed urgently.

Kesharq spun his axe in a dizzying series of loops and twists, the blade a glittering web of silver. He slowly advanced on Uriel, his dead face remaining utterly immobile.

'I was wrong to think of you as worthy meat,' rasped Kesharq. 'The kyerzak was a fool to fear you.'