Becoming aware of her trespass, she suggested, 'I could come back later, at a better time.’

'No, now's fine.’ He sat back down on the metal stool where he had been perching when she'd entered. 'Let me see... When we got inside the palace, what we found was the Invisibles.’

*Why were they called that?' she asked. 'Because we couldn't see them.’ he replied.

THE INVISIBLES WERE waiting for them, and they well deserved their sobriquet.

Just ten paces into the splendid apartments, the first brother died. There was an odd, hard bang, so hard it was painful to feel and hear, and Brother Edrius fell to his knees, then folded onto his side. He had been struck in the face by some form of energy weapon. The white plasteel.’ceramite alloy of his visor and breastplate had actually deformed into a rippled crater, like heated wax that had flowed and then set again. A second bang, a quick concussive vibration of air, obliterated an ornamental table beside Nero Vipus. A third bang dropped Brother Muriad, his left leg shattered and snapped off like a reed stalk.

The science adepts of the false Imperium had mastered and harnessed some rare and wonderful form of field technology, and armed their elite guard with it. They cloaked their bodies with a passive application, twisting light to render themselves invisible. And they were able to project it in a merciless, active form that struck with mutilating force.

Despite the fact that they had been advancing combat-ready and wary, Loken and the others were taken completely off guard. The Invisibles were even hidden to their visor arrays. Several had simply been standing in the chamber, waiting to strike.

Loken began to fire, and Vipus's men did likewise. Raking the area ahead of him, splintering furniture, Loken hit something. He saw pink mist kiss the air, and something fell down with enough force to overturn a chair. Vipus scored a hit too, but not before Brother Tar-regus had been struck with such power that his head was punched clean off his shoulders.

The cloak technology evidendy hid its users best if mey remained still. As they moved, they became semi-visible, heat-haze suggestions of men surging to attack. Loken adapted quickly, firing at each blemish of air. He adjusted his visor gain to full contrast, almost black and white, and saw them better: hard oudines against the fuzzy background. He killed three more. In death, several lost their cloaks. Loken saw the Invisibles revealed as bloody corpses. Their armour was silver, ornately composed and machined with a remarkable detail of patterning and symbols. Tall, swathed in mandes of red silk, the Invisibles reminded Loken of the mighty Custodian Guard that warded the Imperial Palace on Terra. This was the bodyguard corps which had executed Sejanus and his glory squad at a mere nod from their master.

Nero Vipus was raging, offended by the cost to his squad. The hand of the ship was truly upon him.

He led the way, cutting a path into a towering room beyond the scene of the ambush. His fury gave Locasta the opening it needed, but it cost him his right hand, crushed by an Invisible's blast. Loken felt choler too. Like Nero, the men of Locasta were his friends. Rituals of mourning awaited him. Even in the darkness of Ullanor, victory had not been so dearly bought.

Charging past Vipus, who was down on his knees, groaning in pain as he tried to pluck the mangled gauntlet off his rained hand, Loken entered a side chamber, shooting at the air blemishes that attempted to block him. A jolt of force tore his bolter from his hands, so he reached over his hip and drew his chainsword from its scabbard. It whined as it kicked into life. He hacked at the faint oudines josding around him and felt the toothed blade meet resistance. There was a shrill scream. Gore drizzled out of nowhere and plastered the chamber walls and the front of Loken's suit.

'Lupercal!' he grunted, and put the full force of both arms behind his strokes. Servos and mimetic polymers, layered between his skin and his suit's outer plating to form the musculature of his power armour, bunched and flexed. He landed a trio of two-handed blows. More blood showered into view. There was a warbled shriek as loops of pink, wet viscera suddenly became visible. A moment later, the field screening the soldier flickered and failed, and revealed his disembowelled form, stumbling away down the length of the chamber, trying to hold his guts in with both hands.

Invisible force stabbed at Loken again, scrunching the edge of his left shoulder guard and almost knocking him off his feet. He rounded and swung the chainsword. The blade struck something, and shards of metal flew out. The shape of a human figure, just out of joint with the space it occupied, as if it had been cut out of the air and nudged slightly to the left, suddenly filled in. One of the Invisibles, his charged field sparking and crackling around him as it died, became visible and swung his long, bladed lance at Loken.

The blade rebounded off Loken's helm. Loken struck low with his chainsword, ripping the lance out of the Invisible's silver gauntlets and buckling its haft. At the same time, Loken lunged, shoulder barging the warrior against the chamber wall so hard that the friable piaster of the ancient frescoes crackled and fell out.

Loken stepped back. Winded, his lungs and ribcage almost crushed flat, the Invisible made a gagging, sucking noise and fell down on his knees, his head lolling forward. Loken sawed his chainsword down and sharply up again in one fluid, practiced mercy stroke, and the Invisible's detached head bounced away.

Loken circled slowly, the humming blade raised ready in his right hand. The chamber floor was slick with blood and black scraps of meat. Shots rang out from nearby

rooms. Loken walked across the chamber and retrieved his bolter, hoisting it in his left fist with a clatter.

Two Luna Wolves entered the chamber behind him, and Loken briskly pointed them off into the left-hand colonnade with a gesture of his sword.

'Form up and advance.’ he snapped into his link. Voices answered him.

'Nero?'

'I'm behind you, twenty metres.’

'How's the hand?'

'I left it behind. It was getting in the way.’

Loken prowled forward. At the end of the chamber, past the crumpled, leaking body of the Invisible he had disembowelled, sixteen broad marble steps led up to a stone doorway. The splendid stone frame was carved with complex linenfold motifs.

Loken ascended the steps slowly. Mottled washes of light cast spastic flickers through the open doorway. There was a remarkable stillness. Even the din of the fight engulfing the palace all around seemed to recede. Loken could hear the tiny taps made by the blood dripping off his outstretched chainsword onto the steps, a trail of red beads up the white marble.

He stepped through the doorway.

The inner walls of the tower rose up around him. He had evidently stepped through into one of the tallest and most massive of the palace's spires. A hundred metres in diameter, a kilometre tall.

No, more than that. He'd come out on a wide, onyx platform that encircled the tower, one of several ring platforms arranged at intervals up the height of the structure, but there were more below. Peering over, Loken saw as much tower drop away into the depths of the earth as stood proud above him.

He circled slowly, gazing around. Great windows of glass or some other transparent substance glazed the

tower from top to bottom between the ring platforms, and through them the light and fury of the war outside flared and flashed. No noise, just the flickering glow, the sudden bursts of radiance.

He followed the platform round until he found a sweep of curved stairs, flush with the tower wall, that led up to the next level. He began to ascend, platform to platform, scanning for any blurs of light that might betray the presence of more Invisibles.