Las-beams speared next, and the space between the wall top and the scaling party filled with violence. The daemons were unnaturally resilient, protected from death by the energies of the warp, and though many were felled, others weathered the fire, and clambered up still, unharmed and uncaring of their dead. Messinius no longer needed his helm’s magnification to see into the daemon champion’s eyes. It stared at him, its smile a promise of death. The terror that preceded them was replaced by the urge to violence, and that gripped them all, foe and friend. The baseline humans began to lose their discipline. A man turned and shot his comrade, and was shot down in turn. Kryvesh banged the foot of his borrowed banner and called them back into line. Elsewhere, his warriors sang; not their Chapter warsongs, but battle hymns known to all. Wavering human voices joined them. The feelings of violence abated, just enough.

Then the things were over the parapet and on them. Messinius saw ­Tidominus carried down by a group of daemons, his unit signum replaced by a mortis rune in his helm. The enemy champion was racing at him. Messinius emptied his bolt pistol into its face, blowing half of it away into a fine mist of daemonic ichor. Still it leapt, hurling itself twenty feet over the parapet. Messinius fell back, keeping the creature in sight, targeting ­skating over his helmplate as the machine-spirit tried to maintain a target lock. Threat indicators trilled, shifting up their priority spectrum.

The daemon held up its enormous gnarled hands. Smoke whirled in the space between, coalescing into a two-handed sword almost as tall as Messinius. By the time its hoofed feet cracked the paving slabs of the square, the creature’s weapon was solid. Vapour streaming from its ruined face, it pointed the broadsword at Messinius and hissed a wordless challenge.

‘Accepted,’ said Messinius, and moved in to attack.

The creature was fast, and punishingly strong. Messinius parried its first strike with an outward push of his palm, fingers spread. Energy crackled. The boom generated by the meeting of human technology and the sorceries of the warp was loud enough to out-compete the guns, but though the impact sent pain lancing up Messinius’ arm, the daemon was not staggered, and pressed in a follow-up attack, swinging the massive sword around its head as if it weighed nothing.

Messinius countered more aggressively this time, punching in to the strike. Another thunderous detonation. Disruption fields shattered matter, but the daemon was not wholly real, and the effect upon it was lesser than it would be upon a natural foe. Nevertheless, this time it was thrown backwards by the blow. Smoke poured from the edge of its blade. It licked black blood from its arm and snarled. Messinius was ready when it leapt: opening his fist, ignoring the sword as it clashed against his pauldron and sheared off a peeling of ceramite, he grabbed the beast about its middle.