Where is Frome?' Eidolon had asked bluntly.

August had shrugged, helplessly.

"Where is the commander of the army divisions?'

A second pitiful shrug. They are all down there.’

Down there. On Murder. The world was a hazy, grey orb, mottled with storm patterning in the atmosphere. Drawn to the lonely system by the curious, untranslatable broadcasts of the outstation beacons, a clear and manifest trace of sentient life, the 140th Expedition had focussed its attentions on the fourth planet, the only orb in the star's orbit with an atmosphere. Sensor sweeps had detected abundant vital traces, though nothing had answered their signals.

Fifty Blood Angels had dropped first, in landers, and had simply disappeared. Previously calm weather cycles had mutated into violent tempests the moment the landers had entered the atmosphere, like an allergic reaction, and swallowed them up. Due to the suddenly volatile climate, communication with the surface was

impossible. Another fifty had followed, and had similarly vanished.

That was when Frome and the fleet officers had begun to suspect that the life forms of One Forty Twenty somehow commanded their own weather systems as a defence. The immense storm fronts, later dubbed 'shield-storms', that had risen up to meet the surface-bound landers, had probably obliterated them. After that, Frome had used drop-pods, the only vehicles that seemed to survive the descent. Frome had led the third wave himself, and only partial messages had been received from him subsequently, even though he'd taken an astrotelepath with him to counter the climatic vox-interference.

It was a grim story. Section by section, August had committed the Astartes and army forces in his expedition to surface drops in a vain attempt to respond to Frame's broken pleas for support. They had either been destroyed by the storms or lost in the impenetrable maelstrom below. The shield-storms, once roused, would not die away. There were no clean surface picts, no decent topographic scans, no uplinks or viable communication lines. One Forty Twenty was an abyss from which no one returned.

'We'll be going in blind.’ Eidolon had told his officers. 'Drop-pod descent.’

'Perhaps you should wait, lord.’ August had suggested. "We have word that a Blood Angels force is en route to relieve Captain Frome, and the Luna Wolves are but four days away. Combined, perhaps, you might better-'

That had decided it. Tarvitz knew Lord Eidolon had no intention of sharing any glory with the Warmas-ter's elite. His lord was relishing the prospect of demonstrating the excellence of his company, by rescuing the cohorts of a rival Legion... whether the word 'rescuing' was used or not. The nature of the

deed, and the comparisons that it made, would speak for themselves. Eidolon had sanctioned the drop immediately.

The nature of the enemy

A trace

The purpose of trees

THE MEGARACHNID WARRIORS were three metres tall, and possessed eight limbs. They ambulated, with dazzling speed, on their four hindmost limbs, and used the other four as weapons. Their bodies, one third again as weighty and massive as a human's, were segmented like an insect's: a small, compact abdomen hung between the four, wide-spread, slender walking limbs; a massive, armoured thorax from which all eight limbs depended; and a squat, wide, wedge-shaped head, equipped with short, rattling mouthparts that issued the characteristic chittering noise, a heavy, ctenoid comb of brow armour, and no discernible eyes. The four upper limbs matched the trophy Lucius had taken in the first round: metal-cased blades over a metre in length beyond the joint. Every part of the megarachnid appeared to be thickly plated with mottled, almost fibrous grey armour, except the head crests, which seemed to be natural, chitinous growths, rough, bony and ivory.

As the fighting wore on, Tarvitz thought he identified a status in those crests. The fuller the chitin growths, the more senior - and larger - the warrior.

Tarvitz made his first kill with his bolter. The megarachnid lunged out of the suddenly vibrating stalks in front of them, and decapitated Kercort with a flick of its upper left blade. Even stationary, it was a hyperactive blur, as if its metabolism, its very life, moved at some rate far faster than that of the enhanced gene-seed warriors of Chemos. Tarvitz had opened fire, denting the centre line of the megarachnid's thorax armour with three shots, before his fourth obliterated the thing's head in a shower of white paste and ivory crest shards. Its legs stumbled and scrabbled, its blade arms waved, and then it fell, but just before it did, there was another crash.

The crash was the sound of Kercort's headless body finally hitting the red dust, arterial spray jetting from his severed neck.

That was how fast the encounter had passed. From first strike to clean kill, poor Kercort had only had time to fall down.

A second megarachnid appeared behind the first. Its flickering limbs had torn Tarvitz's bolter out of his hands, and set a deep gouge across the facing of his breastplate, right across the Imperial aquila displayed there. That was a great crime. Alone amongst the Legions, only the Emperor's Children had been permitted, by the grace of the Emperor himself, to wear the aquila on their chestplates. Backing away, hearing bolter fire and yells from the shivering thickets all around him, Tarvitz had felt stung by genuine insult, and had unslung his broadsword, powered it, and struck downwards with a two-handed cut. His long, heavy blade had glanced off the alien's headcrest, chipping off flecks of yellowish bone, and Tarvitz had been

forced to dance back out of the reach of the four, slicing limb-blades.

His second strike had been better. His sword missed the bone crest and instead hacked deeply into the megarachnid's neck, at the joint where the head connected to the upper thorax. He had split the thorax wide open to the centre, squirting out a gush of glistening white ichor. The megarachnid had trembled, fidgeting, slowly understanding its own death as Tarvitz wrenched his blade back out. It took a moment to die. It reached out with its quivering blade-limbs, and touched the tips of them against Tarvitz's recoiling face, two on either side of the visor. The touch was almost gentle. As it fell, the four points made a shrieking sound as they dragged backwards across the sides of his visor, leaving bare metal scratches in the purple gloss.

Someone was screaming. A bolter was firing on full auto, and debris from exploded grass stalks was spilling up into the air.

A third hostile flickered at Tarvitz, but his blood was up. He swung at it, turning his body right around, and cut clean through the mid line of the thorax, between upper arms and lower legs.

Pale liquid spattered into the air, and the top of the alien fell away. The abdomen, and the half-thorax remaining, pumping milky fluid, continued to scurry on its four legs for a moment before it collided with a grass stalk and toppled over.

And that was the fight done. The stalks ceased their shivering, and the wretched grubs started to whistle and buzz again.

WHEN THEY HAD been on the ground for ninety hours, and had engaged with the megarachnid twenty-eight times in the dense thickets of the grass forests, seven of their meagre party were dead and gone. The process of

advance became mechanical, almost trance-like. There was no guiding narrative, no strategic detail. They had established no contact with the Blood Angels, or their lord, or any segments of other sections of their company. They moved forwards, and every few kilometres fighting broke out.

This was an almost perfect war, Saul Tarvitz decided. Simple and engrossing, testing their combat skills and physical prowess to destruction. It was like a training regime made lethal. Only days afterwards did he appreciate how truly focussed he had become during the undertaking. His instincts had grown as sharp as the enemy limb-blades. He was on guard at all times, with no opportunity to slacken or lose concentration, for the megarachnid ambushes were sudden and ferocious, and came out of nowhere. The party moved, then fought, moved, then fought, without space for rest or reflection. Tarvitz had never known, and would never know again, such pure martial perfection, utterly uncomplicated by politics or beliefs. He and his fellows were weapons of the Emperor, and the megarachnid were the unqualified quintessence of the hostile cosmos that stood in man's way.