Later, humans tried to venture into the ruins, as well, to explore the collapsed chambers and crumbling passageways, even to find their way underground. None of them had the code. Antrax destroyed them all. Yet others returned from time to time, some of them becoming recognizable by their look and feel, some of them persistent in their efforts. Like ants, they tunneled and burrowed, little annoyances that refused to be chased away for more than a short time. Even the lasers and probes failed to discourage them. Antrax began to explore other solutions. It found interesting possibilities in its memory banks and experimented with them. The wronks proved the most successful. Something about revisiting the dead was especially frightening to humans.

  They gave it a name. Antrax. They took it from their own language. Antrax had no idea what it meant. Nor did it care to know. What mattered was that they knew it was there. That was enough to accomplish what was needed. The humans began to avoid the ruins. They no longer spent time searching for entrances into the catacombs beneath.

  But Antrax had grown fond of its wronks, which it adapted to serve other needs. It continued to harvest humans for the parts that the wronks needed. It continued to experiment. The humans were no longer intruders; they were prey.

  It was the failure of the first energy cell that prompted Antrax to explore the larger world. There were three such cells, vast capacitors that drew their energy from the sun and fed it into the receptors so that Antrax could function. The cells were meant to last forever, so long as there was sun and light. But everything has a finite life, even components that are built to last forever, especially when those components are overworked. Antrax had evolved in its time as guardian of the catacombs. Its commitments to its directive had multiplied, and its hunger had grown. It needed more fuel than anticipated by its creators. Its cells were being drained of energy more quickly than the sun could replenish them. Perhaps it was the strain of maintaining the lasers and probes and wronks. Perhaps the efficiency of the cells had been grossly overestimated to begin with. Whatever the case, Antrax was losing power.

  It decided that another source of energy must be found.

  It acted quickly. It sent its probes in search of such a source, far out into the world, beyond what Antrax knew. The probes were not meant to return, only to send the information they acquired. They did as they were programmed to do, and while most places were empty of human life and of the sources of energy Antrax required, one place showed promise. It was across the sea to the east, a land in which humans had survived the Great Wars. Theirs was a rudimentary civilization in many ways, but there were possibilities to be explored. The Old World had changed and Mankind had evolved. The sciences of the past were barely in evidence. Instead, there was a new kind of science. Elements of that science were able to generate power far greater than that which sustained Antrax. The elements could be found in weapons and talismans borne by the descendants of his creators. But genetics and training had infused a few of those men and women with the elements of power, so that in some the power was generated from within.

  A dream, or what the dreamer thought was one, had brought the first of the Great War survivors to Antrax thirty years before. Of those, only one was useful. Now that one, supplied with a map that revealed the existence of the catacombs and their contents, had lured others. What had value for the creators would have value for their descendants, whether Antrax comprehended the nature of that value or not. Examined and measured on the islands that Antrax had established as testing grounds through probes dispatched years earlier, subjected to attacks by creatures and spirits no ordinary human could hope to overcome, a few had shown themselves more powerful than their fellows and were therefore suitable for culling. Three at least had come into the ruins overhead, and perhaps more waited without. Antrax would use them as it had used the one thirty years earlier, as components essential to its continued existence, necessary sacrifices to its directive. The creator had been specific. The lives of humans were expendable. It was Antrax who must survive.

  Deep within the corridors and chambers of its domain, Antrax slowed its spinning passage and paused to take inventory of those it would use to feed it.

  One was momentarily beyond its reach, although a special wronk was being constructed to hunt it down.

  The second was already on his way.

  But it was the third that interested Antrax most. That one had actually penetrated all the way into the catacombs. It had bypassed the code at the tower door. It was not a creator, one of the expected ones, but it had resources and incredible inner power. Antrax could not determine the source of its power, only its measure. What mattered was that there was enough of it to sustain Antrax for decades to come, perhaps for centuries, limited only by the capacity of the available storage units.

  Already Antrax was gathering and converting that power, drawing it from the intruder without his realizing, leeching it away bit by bit. It seemed to replenish itself, so the leeching was not yet detrimental to the intruder’s health. But that could change. Antrax would have to monitor it closely. Reaching out with its sensors to take the necessary readings, it took a moment to do so, finding the intruder still working hard in his futile effort to escape.

  The Druid known as Walker, who, in a time before he lost his arm and found his destiny, had been called both Walker Boh and Dark Uncle, was seeking his way yet again. He stood in one of the myriad passageways of Castledown and tried to understand what he was doing wrong. His stomach roiled and his head ached. Something was amiss. Even without knowing what it was, he could feel it as surely as he could feel the discomfort in his body. All of his efforts to outdistance his pursuers had failed. All of his attempts to escape had led to nothing.

  Behind him in the near darkness of the corridors and chambers, invisible for the moment, but there nevertheless, the creepers hunted him. He had fled them from the moment he had dropped through the floor of the black tower and spiraled down a chute into these lower depths. They had found him at once, and he had fought them off and escaped. But everywhere he turned, everywhere he went, they were waiting. Castledown was full of them, prowling the depths in such numbers that Walker could not see how an army could stand against them, let alone a single man. Yet he would do so, for as long as he was able, for as long as his strength allowed it.

  What baffled him, in his desperate flight, was how unendingly similar everything was. Corridors and rooms without number, all empty of anything other than machinery built into the walls and lines of power that fed those machines, all of them the same. Nothing was different about any of them; nothing suggested the presence of the treasure he sought. There were no hidden doorways or secret passages, no concealing panels behind which or under which or above which a treasure might lie. He could detect nothing of what he was certain was there. He knew what he was looking for. Unlike the others who had come searching for it, save perhaps the Ilse Witch, he knew exactly what it was that he must find.

  Unless it was all a clever lie, created by the mapmaker to lure and trap him.

  Yet he had discarded that possibility long ago. The knowledge contained in those symbols and markings was more revealing than the mapmaker had intended. Unwittingly, perhaps, the mapmaker had given away a truth it did not fully understand.

  That Castledown was a trap had been obvious almost from the beginning, and the reason for that trap became clear after their experiences on the islands of Flay Creech, Shatterstone, and Mephitic. What lived within Castledown wanted their magic. What it wanted the magic for, what purpose it intended for its use, remained a mystery. Walker was not even clear as yet as to whether his adversary was looking for a specific form of magic. It might be seeking only another wielder for the missing Elfstones, someone to take Kael Elessedil’s place. It might be looking for something more.

  Whatever the case, it had used the castaway and the map as bait, the keys as lures, the islands as testing grounds, the spirits and creatures on those islands as measuring sticks, and its victims’ curiosity and
persistence as goads. The keys they had struggled so hard to obtain were worthless in any real sense, of course. He still carried them within his robes, but had long since discarded the possibility that they would prove useful. They were lures and nothing more. But the map, notwithstanding its maker’s belief that it, too, was only bait, was invaluable.

  None of which helped Walker in his plight. He began moving along the passageways once more, probing as he did so, seeking either to escape or to find the hidden treasure. Either would give him what he needed, a way out, a weapon to use against his mysterious adversary. He wondered at the fate of those still aboveground. They would never find him. They might not even try. The destruction they had encountered might have demoralized them utterly. If he was lost, they would reason, what chance had they? He had to hope that one or two would hold the rest together, that those he counted on most to stand firm would find a way do so.

  Nevertheless, he had to get back to them quickly. Time was working against him; he had to get clear of the maze.

  Creepers appeared from out of the walls right in front of him. Bright bursts of Druid fire lanced from the fingers of his good arm. Bits and pieces of his attackers flew apart, and then he was rushing past their remains, finding others waiting ahead. He destroyed them, as well, still advancing, knowing they could track him by his magic, that they could determine his progress by his use of magic. The less he expended, the better. Yet he could not hide completely, not mask his passage sufficiently, no matter what he did.

  He rounded a corner and found a new set of passageways. Winded and aching, he pressed his back against the cool of the metal wall and clutched at his churning stomach with his hand. The maze of chambers and corridors was disorienting. He peered ahead and then back. He had come that way before. Or another way just like it. He was traveling in circles, careening this way and that to no discernible end. His mind spun with the possibilities of what might be happening, but a new rush of creepers distracted him and forced him to stand and fight once more.

  He charged into them, hurtling them aside with his magic, slamming them against the walls of the passageway and turning them into smoking, shattered heaps. Again, he broke free.

  Moments later, he was alone again, a solitary fugitive in an unfamiliar world. He still didn’t feel right. It was there in his bones and in his heart. He was half a step slower in his movements, a shade duller in his thinking, off balance just enough that he wasn’t functioning as he knew he should. Why would that be? He sped through shadows and pools of light given off by smokeless lamps, trying to find an answer.

  But no answer came to him. He ran on, searching for help that wasn’t there.

  Antrax monitored the human a few moments longer, taking measurements. The siphon was unobstructed and strong. Power from the expenditure of the intruder’s fire surged into the converters, then into the capacitors housing the fuel on which Antrax would feed. Antrax would let the human run from the creepers awhile longer, then change the scenario to give him something else to do. The possibilities were endless. But caution was needed. The human was intelligent; he was quick to reason things out. If Antrax wasn’t careful, wasn’t subtle enough, he would see through the subterfuge. That could not be allowed to happen.

  Dismissing him, Antrax spun back down the miles of power lines that wound through the passageways and chambers, feeding out its sensors as it made a quick survey of its perimeter. No boundaries had been breached. No further intruders had tried to enter. Satisfied, it switched back to the room in which the special wronk was being constructed.

  Matters were progressing as expected. Surgeon probes were assembling the wronk with their customary skill and delicate touch. The parts lay spread out on gurneys, those of metal sterilized and wrapped, those of flesh and bone hooked to the life-support systems, artificial body fluids pumping steadily through arteries and veins. Already the process of joining flesh to metal and synthetics had begun, a fusing technique developed in the waning days of the Old World and perfected since by Antrax through study and experimentation. There had been failures for a long time; madness had claimed the early wronks and negated their usefulness. But eventually Antrax had found a way to control the wronk mind sufficiently that insanity was not an option. Breakdowns eventually rendered the wronks useless, but they were longer coming and less devastating when they arrived. Now and again, the damage could be repaired and the wronks put back into service. The surgeon probes were quite efficient at their work.

  Through images conveyed by its sensors, Antrax studied the face of its latest subject as its head floated in the preserving fluid. The eyes stared out, shifting back and forth, searching for a way to escape, not understanding that the means for doing so had long since been stripped away. The meds, fed in through tubes that ran down its throat, kept it stable and calm. Its mouth was open, as if it were a fish feeding. It was in perfect condition.

  Antrax took quick inventory of the still-unassembled parts. When it was complete, the wronk would be the most dangerous ever built, in no small part because the human from which it was being constructed was an excellent specimen with superb skills. To bring the other elements of power to bay and to overcome the humans that wielded them, it would have to be. But the technology of the Old World could accomplish anything. Antrax would have its sources of power in hand and working for its benefit before long.

  Let the humans run as fast and far as they could manage, it thought. In the end, it would not matter. Castledown and its catacombs had been given to it to preserve and protect, but the world beyond, even that part so distant it was still a mystery, was not out of reach. The creators had given Antrax a directive, and there were no restrictions on the methods it could employ to fulfill it. If the power Antrax required lay elsewhere, it would find a way to bring it close. If the energy it needed must be obtained at the cost of human lives, so be it.

  Antrax had been programmed to believe that nothing was more important than its survival. Nothing had happened to change that belief.

  The hand that clamped on his shoulder and shook Bek from his slumber was rough and urgent. “Wake up!” Truls Rohk hissed in his ear. “She’s found us!”

  Bek didn’t need to ask whom the shape-shifter was talking about. The Ilse Witch. His sister. His enemy. He lurched to his feet, still half-asleep. He blinked to get his bearings, to clear his head. He was only partially successful. He felt the other’s hand steady him, less compelling, almost gentle. “How close is she?” he managed.

  “Close enough to hear you sneeze,” the other whispered, gesturing behind him into the dark.

  It was still night, the sky a tapestry of stars against which thin strips of broken clouds floated like linen. The quarter-moon was a tipped crescent on the northern horizon. The woods about them were an impenetrable black. She was tracking them in the dark, Bek realized. How could she do that? Could she read the traces of their body heat and energy even at night? He supposed she could. There wasn’t much she couldn’t do with the magic of the wishsong to aid her. He had fallen asleep at sunset, certain they had lost her in the meadow, that they had left her far enough behind to ensure at least one good night’s sleep. So much for being certain.

  “How could she find us so fast?” he whispered. He took a few deep breaths, shivering as a sudden gust of chill wind blew down off the mountains.

  Truls Rohk’s face was unreadable within the shadows of his cowl. “Luck, I would guess. She shouldn’t have had any left after what we did to throw her off, but she’s resourceful enough that she makes her own. Start walking.”

  Snatching up their few supplies, they departed their camp, heading inland once more, moving parallel to the base of the mountains. They made no effort to hide their passage out. If the Ilse Witch had tracked them that far, she would have no trouble discovering where they had spent the night. Bek was wondering if he had been saved by Truls Rohk’s instincts or by his foresight. Whichever it was, it gave Bek a renewed sense of dependence on him. Bek had slept, after all. If
he had tried to flee alone from his sister, she would have had him already.

  He shook his head. What would that mean for him, to be in her hands? When it finally happened, when she finally caught up to them, as he felt certain she must, what would transpire?

  They slid down a steep hillside to a rocky flat and hurried across to a river. They waded in, moving upstream, crossing to the far side to make their way below the bank. The water was icy cold and swift, and Bek had to concentrate hard on keeping his feet planted solidly beneath him.

  “Either she stumbled on our real trail and is relying still on her magic to track us or she’s found an ally who can read sign.” The shape-shifter’s voice was low and menacing, a whisper of dark anger above the soft gurgle of the water. His cloaked form seemed to glide through the shallows, his movements steady and deliberate against the current. “We’ll have to find out which.”

  They continued upstream for a mile or so, then climbed out on a rocky flat on the far shore and worked their way inland for a time. East, the sky was beginning to brighten with a silver glow as sunrise neared. Bek found himself thinking of sunrise in the Highlands of Leah, of hunts with Quentin in the early dawn, of how much alike it felt and yet how different, too. Awake now, his mind picked its way nimbly through the debris of his life. He wasn’t afraid anymore, not in the way he had been afraid in the ruins of Castledown when the fire threads and creepers had attacked them. But he was feeling lost; he was feeling disconnected. Everything he knew from his past life had been stripped away from him—his home, his family, and his land. There was nothing left of any of it, and the farther he walked, the more unlikely it seemed that he would ever have any of it back.

  It was as if he were walking out of himself, as if he were shedding his skin.

  He hitched up the Sword of Shannara across his back and tried to find comfort in its solid, dependable presence, but could not.