On the morning of the third day, an hour into the walk, Brynja said: 'I was a Valkyrie.'

  She said it the way she said most things: without preamble, while moving, as if the words had been building pressure for long enough that releasing them was a matter of simple practicality. She did not slow her pace.

  'I served Asgard. I collected the worthy dead from battlefields and carried them to Valhalla. I had wings and a purpose and a place in an order that has existed since the gods first made war. I was very good at what I did.'

  Ulfar kept walking. He had learned, over two days, that the correct response to whatever Brynja chose to offer was silence and forward motion. Stopping or turning toward her caused the same effect as a sudden noise near a wild thing: the withdrawal was immediate and total.

  'What happened?' he said, to the path ahead.

  'I refused an order.' Her voice was flat. 'I was sent to collect a soul I judged undeserving of Valhalla. A child-killer. A man who had slaughtered his own household for a slight. Valhalla takes the brave dead, not the monstrous dead, and I refused to carry him. My superiors disagreed. My wings were clipped.' A pause in which the only sound was the wind across open heather. 'I was sent here.'

  The word 'clipped' arrived like something dropped from a height. Too small for what it described. He thought about the cut threads at her shoulders, the clean cauterised endings where something vast had been severed, and did not say anything for a long time.

  'I'm sorry,' he said, eventually.

  'Don't be. I was right and they were wrong and I would do it again.'

  They walked on. The moor gave way to the first signs of lower ground --- the heather thinning, the track beginning its long descent toward the hills that cupped Hrafnstead in their palm. She did not look at him. He did not look at her. The sky ahead was the iron-grey of a day that had used up all its light without ever quite managing to be bright, and on the ridge ahead of them, where the path crested before the final descent, a curlew called once and went silent.

  'The threads at your shoulders,' he said. 'I saw them the first night. Before you told me anything. I tried to read the story.'

  'I know,' she said. 'I could see you trying.' Something in her voice that was not quite an edge and not quite the absence of one. 'Skalds.'

  It was not said with warmth. But it was not said without it either.

  They reached Hrafnstead on the third day, in the last hour of usable light, and Ulfar knew it was wrong before they crested the final ridge.

  He could feel it through the rune. Not the Wyrd-sight --- he had not opened that yet --- but a deeper register, something the mark on his palm picked up the way a hand held near a fire picks up heat. A wrongness in the ground beneath his feet. A thinning. As if the land itself were holding its breath.

  Brynja felt it too. She had been walking with her usual relentless pace, but in the last mile she slowed, and her hand moved to the knife at her belt --- not drawing it, just resting there, the gesture of someone confirming a weapon's position before entering a space where weapons might matter. It was the first time Ulfar had seen her touch the knife since they'd left the grove. She carried it the way someone carries a thing they have used so often it has become part of their body, and the fact that she was reaching for it now told him more about what lay ahead than anything she might have said.

  'You can feel it,' she said. Not a question.

  'Something pulling. Like the ground is thinner here.'

  'The frequency is dropping. Hrafnstead's land-spirit was strong --- I visited this site four years ago and the resonance was clean. Whatever is happening, it has progressed further here than at the crossroads.'

  They came over the ridge and looked down.

  Hrafnstead was a sacred site of the old kind --- a natural bowl in the hills where three streams met, ringed by standing stones and a grove of birch trees that had been planted, according to tradition, by the first people to settle this part of Midgard. The streams fed a pool at the centre that Grima had once described to him as one of the clearest points of contact between the physical world and the land-spirit beneath. She had visited Hrafnstead twice in his lifetime and come back both times with something restored in her --- not younger, exactly, but steadier, as if the place had reminded her of something she had been in danger of forgetting.

  The birch grove was dying. Not dead --- not the violent, sudden emptying of his home grove. This was slower, more patient. The trees at the edge of the bowl were still green, or near enough. But as his eye moved inward, toward the centre where the pool should have been, the colour drained away. The innermost trees were grey. Their leaves had not fallen; they had bleached on the branch, as if something had pulled the life out of them leaf by leaf, working inward from the heart. The pattern was clear even without the Wyrd-sight. A circle of death expanding outward from a central point, like a stain spreading through cloth.

  And the trees were growing away from the centre. He could see it in the angles of their trunks --- a subtle lean outward, as if the birches had been trying to move their roots away from whatever was at the heart of the site. Trees did not move. But these had tried.

  'Open your sight,' Brynja said. Her voice was quiet.

  He found the sense and opened it. The Wyrd-threads appeared, their now-familiar silver web overlaying the physical landscape. And he saw what was wrong.

  The threads at the centre of Hrafnstead had been cut. The same clean severance he had seen at his grove --- the same signature, the same smooth cauterised endings where connection should have been. But the scale was larger. At his grove, the cutting had been focused on the land-spirit's anchor points. Here, the cuts extended outward from the centre in lines that followed the streams, as if someone had used the waterways as guides for the blade. Dozens of threads severed. Scores. The web at the heart of the site was not just damaged. It was dismantled.

  And beyond the cuts, the remaining threads were being pulled. He could see it --- a slow, steady tension drawing the surviving threads inward, toward the centre, toward the point where the cuts had been made. As if the damage were feeding on itself. The cuts created a gap, and the gap was pulling the surrounding web into it, and the web was fraying under the strain, and the fraying was creating new gaps.

  'It's spreading,' he said. 'The damage. It's pulling the surrounding threads in and breaking them.'

  'Yes.' Brynja's voice was very controlled. 'This site was cut weeks ago, at least. What you're seeing is the secondary collapse. The initial cut was targeted and precise. Everything since has been cascading failure.'

  They descended into the bowl. The air grew colder with every step, though the cold was not physical --- it was the absence that Ulfar was learning to recognise, the emptiness left behind when meaning was pulled from a place. The birch trees stood in their quiet rows, their grey leaves hanging motionless. No wind reached the bottom of the bowl. No birds called. The streams still ran, their water clear and cold, but the sound they made was flat. Water over stones without resonance.

  He stopped at one of the standing stones that ringed the site. It was shorter than the stones at his grove --- shoulder height, dark granite, polished smooth by centuries of hands laid against it in offering. Runes had been carved into its face in the old style, deep-cut and filled with lichen. He could read them: safe ground, strong spirit, the traveller is welcome. Standard protections. Through the Wyrd-sight, the runes were dark. The power that should have filled them --- the land-spirit's presence flowing through the carved channels the way water flowed through an irrigation ditch --- was gone. The carvings were shapes without content. Letters in a dead language.

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  He touched the stone. Nothing. Not even the faint pulse he had felt at the stream crossing. Whatever had been here was thoroughly gone.

  Brynja was ahead of him, moving between the standing stones with a methodical precision that told him she was cataloguing, comparing this site to whatever she had seen four years ago. She stopped at each stone, studied its face, moved on. Her expression did not change, but the set of her shoulders grew tighter with each one.

  The pool at the centre was still there. It was perhaps twenty feet across, fed by the three converging streams, and it should have been the jewel of the site --- a mirror of sky surrounded by silver birches. Instead the water was dark. Not clouded, not dirty. Dark the way the ground at his grove had been empty. The water was present but the quality that had made it sacred was gone. It was a hole filled with liquid.

  Ulfar knelt at the edge and looked down. His reflection stared back at him --- dark hair, grey eyes that now held a faint luminescence he did not remember having before the rune. The iridescence was new. He filed it away and looked deeper, into the water itself. The surface was still. No wind reached it in the bowl, and the streams that fed it entered so gently that no current disturbed the surface. It was a mirror laid flat on the ground, reflecting the grey sky and the grey birches and nothing else.

  Through the Wyrd-sight, the pool was a wound. The cut threads converged here, their severed ends pointing inward like fingers toward a centre. And at the very bottom, beneath the water, something dark pulsed. Not a physical thing. A presence. An echo of whatever had done the cutting, left behind the way a blade leaves a mark in the wood it has scored.

  'There's something in the pool,' he said. 'Something left behind.'

  Brynja crouched beside him. She stared at the water for a long time, her blade-edge eyes narrowed. 'I can't see what you're seeing. Describe it.'

  'A mark. In the Wyrd-threads. As if whatever cut them left a signature in the cut itself. It's dark --- darker than absence. The threads around it are pulling toward it.'

  'That is a thread-anchor,' she said. 'I have heard of them but not seen one at this scale. When a thread is cut by a trained practitioner, they can leave a mark that continues the work after they have gone. It draws the surrounding threads in and severs them as they arrive. The cut perpetuates itself.'

  'It's still active.'

  'Yes. And it will continue until there are no threads left to pull. This site will be entirely dead within ---' She calculated. 'Two months. Perhaps less.'

  'Can we stop it?'

  'Not at your current level. A thread-anchor is a construct. Removing it requires the ability to work at the same frequency as the person who placed it, and whoever did this was operating well above Midgard's register.' She stood. 'We can observe. We can learn. That is what we came for.'

  She began to walk the perimeter of the pool, studying the ground, the stones, the pattern of the dead birches. Ulfar stayed where he was, looking into the dark water, feeling the thread-anchor's pull through the rune on his palm. It was a patient pull. Not violent. Steady. The kind of force that moved glaciers.

  * * *

  They made camp on the ridge above the bowl, where the air was cleaner and the Wyrd-threads were still mostly intact. Neither of them wanted to sleep inside the site. The wrongness at the centre had a weight to it that pressed on the chest and made breathing feel like effort.

  Brynja built a fire and sat beside it, staring into the middle distance with the focused blankness of someone doing calculations. Ulfar sat across from her and laid out what he knew.

  'The same hand,' he said. 'The cuts at the grove and the cuts at Hrafnstead --- they have the same signature. I can't describe it in terms you'd use, but through the sight they look the same. The same angle. The same cleanness.'

  'I expected that.'

  'You said you visited Hrafnstead four years ago. Was there any sign of this then?'

  'None. The site was healthy. The land-spirit was strong and the resonance was stable.' She picked up a pebble and turned it between her fingers. 'Four years ago, the sacred sites in this region were intact. Your grove was active. The crossroads markers were maintained. Whatever is doing this began recently.'

  'How recently?'

  'Months. Not years.' She set the pebble down with the precision of someone placing a piece on a game-board. 'I have been in Midgard for eleven years. For the first nine, the spiritual landscape was stable. Declining slowly, the way it has been declining for generations --- people abandoning the old practices, land-spirits going untended, the connections weakening through neglect. Slow. Natural. In the last two years, the decline has accelerated. And in the last six months, sites have started dying. Not fading. Dying. Your grove. Hrafnstead. At least three others that I know of in this region alone.'

  'Three others?'

  'I have been walking the land, tracking the damage. There is a pattern. I could feel it forming but I could not see it clearly until tonight.' She met his eyes across the fire. 'You can see it. Your sight shows you things I cannot perceive at Midgard's frequency. Tell me what the pattern looks like.'

  Ulfar thought about the grove. About the crossroads. About Hrafnstead. He thought about the thread-anchor in the pool and the way the cuts followed the stream-lines. He thought about what Grima had said --- that the cutting had opened a wound all the way down to the Root. He thought about the rune-protected stream stones that still held a faint pulse, and the crossroads marker that had already lost its. A gradient. Strongest at the cut sites, weakening outward. The damage was radiating.

  'I'd need to see the other sites,' he said. 'But if they're being cut with the same signature, by the same hand, then this isn't random. Someone is choosing which sites to kill. They started with the strongest --- the grove, Hrafnstead --- and the weaker sites are failing in the aftermath.'

  'Why start with the strongest?'

  'Because the strongest sites anchor the web for everything around them. Kill the grove and the crossroads starts to fail on its own. Kill Hrafnstead and every small shrine and boundary marker in this valley will be dead within the year.' He stopped. The implication was obvious once he said it aloud. 'They're not just killing sites. They're killing the structure. The web itself. Take out the anchor points and everything between them collapses.'

  Brynja was quiet for a long time. The fire burned. The stars turned overhead.

  'In the approach to the last Fimbulwinter,' she said, 'the sacred sites of Midgard went dark. The records in Asgard describe it as a natural process --- the spiritual landscape cooling as the cosmic winter approached. But the records were written by the Aesir, and the Aesir see Midgard the way a farmer sees a field. They note the crop failing. They do not always investigate why.'

  'You think it wasn't natural.'

  'I think that what I am seeing now looks like what the old records describe, and what I am seeing now is not natural. Someone is dismantling the spiritual infrastructure of this region with the skill of a surgeon and the patience of a season. Whether the same thing happened before the last Fimbulwinter, I do not know. But the shape is the same.'

  'Grima told me stories about the Fimbulwinter,' Ulfar said. 'She said the old accounts described the land going quiet before the cold came. The land-spirits retreating. The sacred sites falling silent one by one, like lamps being covered. She called it the world forgetting itself.'

  'Your volva had better instincts than most.' It was the closest thing to a compliment Brynja had offered anyone, living or dead, since Ulfar had known her. 'The world forgetting itself. That is precisely what it feels like.'

  She looked at him and the firelight was on one side of her face and the dark was on the other and for a moment she looked very tired --- not in body but in the way of someone who has been carrying a weight alone for a long time and is only now beginning to understand how heavy it is.

  'The Fimbulwinter is the three-year winter that precedes Ragnarok,' she said. 'If someone is reproducing the conditions that preceded the last one, then what we are looking at is not sabotage. It is preparation.'

  The fire cracked. The word 'Ragnarok' sat between them and neither of them touched it. Ulfar looked at his marked palm. The lines sat quiet and warm.

  'What do we do?' he said.

  'We find the other sites. We map the pattern. We learn who is doing this and why, and whether it can be stopped.' She pulled her cloak tighter. 'That is enough for tonight. Sleep. I will keep watch.'

  'Do you sleep?'

  'When I choose to.'

  He lay down near the fire and closed his eyes. Sleep came slowly, as it had the night before, but eventually the exhaustion of three days' walking and the warmth of the fire pulled him under. His last waking thought was of the thread-anchor in the pool at Hrafnstead, pulsing in its dark patience, doing its work whether anyone was watching or not.

  * * *

  He did not know that Brynja watched him sleep.

  She sat against the ridge-stone with the fire between them and studied him the way she had studied the damaged sites --- with attention and without sentiment. He was an ordinary man in most respects. Broad shoulders from farmwork. Hands that were callused from carving, not from weapons. A face that was weathered rather than handsome, though she had limited interest in the human taxonomy of attractiveness. He slept the way men slept who were used to sleeping outside --- curled on his side, one arm under his head, the other hand closed around the rune on his palm as if protecting it.

  The rune glowed faintly in the dark. She could see it through his fingers --- a soft, steady light that pulsed in time with his heartbeat. She did not know what it would do to him. She did not know what he would become. She had spent six days watching the grove and expecting something terrible to emerge from the damage, and instead this man had walked in and picked up a fragment of the first language and now it was rewriting him from the palm inward, and she could not stop it and was not sure she should try.

  He had asked about her wings. No one had asked about her wings in eleven years. People saw a tall woman with white hair and strange eyes and kept their distance, which was how she preferred it. He had looked at the cut threads on her back and asked what she was, and she had told him the truth, and the world had not changed.

  That, she thought, was not nothing.

  She watched him sleep, and the fire burned low, and the dark over Hrafnstead was deep and patient and full of the slow work of destruction, and she kept her watch until the dawn came grey and cold over the eastern ridge.