Reza stopped five metres short of the brown lump, and slowly opened his arms, rain dripping from his grey-skinned fingers. He shouted something even Kelly’s studio-grade audio-discrimination program couldn’t catch above the wind and rain. She squinted, the rain suddenly chilling inside her T-shirt. The boulder rose up smoothly on four powerful legs. Kelly gasped. Her Confederation generalist didactic memory identified it immediately: a soldier-caste Tyrathca.

“Oh bugger,” Jalal muttered. “They’re clan creatures, it won’t be alone.” He started to scan around. It was hopeless in the rain, even infrared was washed out.

The soldier-caste Tyrathca was about as big as a horse, although the legs weren’t as long. Its head, too, was faintly equine, tilted back at a shallow angle at the end of a thick muscular neck. There were no visible ears, or nostrils; the mouth had a complex double-lip arrangement resembling overlapping clam shells. The sienna hide, which Kelly had thought solid like an exoskeleton, was actually scaled, with a short-cropped chestnut-brown mane running along its entire spine. Two arms extended from behind the base of its neck, ending in nine-fingered circular hands. A pair of slender antennae also protruded from its shoulder joints, swept back along the length of its body.

Although it had a strong animal appearance, it was holding a large very modern-looking rifle. A broad harnesslike belt hung round its neck, with grenades and power magazines clipped on.

It held out a processor block, and a slim AV projection pillar telescoped out. “Turn your vehicles around,” a synthetic voice clanged through the rain. “Humans are no longer permitted here.”

“We need somewhere to shelter for the night,” Reza replied. “We can’t go back north; you must have seen the red cloud.”

“No humans.”

“Why not? We must have somewhere to stay. Tell me, why?”

“Humans have become—” The block gave a melodic cheep. “No direct translation available; similarity to: elemental . Coastuc-RT has suffered damage, merchant spaceplane has been stolen. Breeders and other castes have been killed by amok humans. You are not permitted entry.”

“I know about the disturbances in the human villages. I have been sent by the Lalonde Development Corporation to try and restore order.”

“Then do that. Go to your own race’s villages and bring order.”

“We have tried, but the situation was beyond our capability to resolve. There has been a major invasion of an unknown origin.” He just couldn’t bring himself to say possession. The processor block was quiet; he guessed he was talking to a breeder, the soldier caste were only marginally sentient—not that he’d like to go up against one. “I would like to discuss what can be done to protect you from further attack. My team are combat trained and well equipped, we should be able to augment whatever defences you have.”

“Acceptable. You may enter Coastuc-RT by yourself to view the situation. If you believe you are able to increase our defences your team will be allowed to enter and stay.”

“Reza,” Kelly datavised. “Ask if I can come with you, please.”

“I will need to bring two others to assess the area around Coastuc-RT with any degree of accuracy before nightfall,” he said out loud, then datavised: “That makes us quits now.”

“Absolutely,” she replied.

“Two only,” the synthetic voice agreed. “None may carry weapons. Our soldiers will provide protection.”

“As you wish.” He turned and walked back to the first hovercraft, feet sinking up to his ankles in slimy puddles. The processor block AV projection pillar began to emit the reverberative whistles and hoots which were the Tyrathcan speech. Answering calls shrilled through the rain, causing the mercenaries to up their sensor resolution to the maximum in a vain attempt to locate the other soldier castes.

“Ariadne, you come with me and Kelly,” Reza said. “I’ll need someone who can review the area properly. The rest of you wait here. We’ll try and get back before dusk. I’ll leave Fenton and Ryall on picket duty for you.”

Two seemingly tireless soldiers ran alongside the hovercraft all the way to the village, antennae whipping back and forth (they were tail-analogues, helping with balance, according to Kelly’s didactic memory). Kelly wasn’t sure whom they were supposed to be protecting. The guns still appeared incongruous; for creatures that had evolved during the pre-technology tribal era to fight the Tyrathcan version of rough and tumble against enemy tribe soldiers bows and arrows would be more suited.

When she reviewed the entire didactic memory she found that the breeders (the only fully sentient Tyrathca) secreted what amounted to chemical control programs in specialist teats. A breeder would think out a sequence of orders—which plants were edible, how to operate a specific power tool—that would be edited into a chain of molecules by the teat gland. Once instructions were loaded in the brain of a vassal-caste species (there were six types) they could be activated by a simple verbal command whenever required. The chemicals were also used to educate young breeders, making the process a natural equivalent to Adamist didactic imprints and Edenist educational affinity lessons.

The rain was easing off when the hovercraft cleared the crest above Coastuc-RT. Kelly looked down on a broad, gentle valley with extensively cultivated terraces on both sides. An area of nearly twenty square kilometres had been cleared of scrub and grass, rebuilt into irrigated ledges, and planted with young rygar bushes. Coastuc-RT itself sat on the floor of the valley, several hundred identical dark brown towers regimented in concentric rings around a central park space.

Reza steered the hovercraft onto a rough switchback track and set off down the slope. Numerous farmer-caste Tyrathca were out tending the emerald-green bushes—pruning, weeding, patching up the shallow drainage ditches. The farmers were slightly smaller than the soldiers but with thicker arms, endowed with the kind of plodding durability associated with oxen or shire-horses. They saw one or two hunter caste skulking among the bushes, about the same size as Reza’s hounds, but with a streamlined fury that could probably give a kroclion a nasty fright. The escort soldiers whistled and hooted every time the hunters appeared, and they turned away obediently.

The first signs of damage were visible when the hovercraft reached the valley floor. Several towers in the village’s outer ring were broken, five had been reduced to jagged stumps sticking up out of the rubble. Scorch marks formed barbarous black graffiti across the tower walls.

Fields on either side of the road had been churned up by fresh craters. EE explosives, Reza guessed, the village soldier caste had put up a good fight. The road itself had been repaired in several places. An earth rampart had been thrown up around the perimeter, a hundred metres from the outer turret houses. Farmers were still working around its base, using shovels which even Sewell would have been hard pressed to raise.

“Leave your vehicle now,” the synthesized voice from the processor block told them when they were twenty metres away from the barricade of raw loam.

Reza cut the fans and codelocked the power cells. The soldiers waited until they had climbed out, then walked them into the village.

Up close the tower houses were utilitarian, each with four floors, their windows arranged at precise levels. They were made by the builder caste, the largest of all the vassals, who chewed soil and mixed it with an epoxy chemical extravasated in their mouth ducts, producing a strong cement. It gave the walls a smooth, extruded feel, as though the towers had come intact from some giant kiln. There were some modern amenities, bands of solar cell panels tipped most of the turret walls; metal water pipes lay bent and tangled among the rubble. The windows were all glazed.