It was unbearable, and I saw her recoil from it, too; but somehow we had to bear it. “Kasia!” I called to her, choked out, and held the light steady for her to see. I saw her stand there hesitating a moment longer, and then she came stumbling towards me, hands reaching forward. The Wood tore at her as she came, though, branches clawing and vines tangling around her legs, and I could do nothing. I could only stand there and hold the light while she fell and struggled up again, and fell again, terror rising in her face.

“Kasia!” I cried. She was crawling now, still coming, her jaw set with determination, leaving a bloody trail on the fallen leaves and dark moss behind her. She grabbed at roots and pulled herself forward, even while the branches lashed her back, but she was still so far away.

And then I looked back up at her body, at the face inhabited by the Wood, and it smiled at me. She couldn’t escape. The Wood was deliberately letting her try, feasting on her very courage, on my own hope. It could drag her back at any moment. It would let her come close enough to see me, maybe even to feel her own body, the air on her face, and then vines would spring up and lash around her, a storm of falling leaves would shroud her, and the Wood would close up around her again. I moaned a protest, and I almost lost the thread of the spell, and then the Dragon said behind me, his voice strange and remote, as though he spoke from far away, “Agnieszka, the purging. Ulozishtus. Try it. I can finish alone.”

I carefully drew my magic back from the Summoning, carefully, carefully, like tipping up a bottle without letting it drip down the neck. The light held, and I whispered, “Ulozishtus.” It was one of the Dragon’s spells, not the kind that came to me easily; I didn’t remember the rest of the words he’d said over me. But I let the word roll over my tongue, shaping it carefully, and remembered the feeling of it—the fire that had burned in my veins, the terrible sweetness of the potion on my tongue. “Ulozishtus,” I said again, drawing it out slowly, “Ulozishtus,” and made each syllable a small spark struck on tinder, a scrap of magic flying out. And inside the Wood, I saw a thin trail of smoke going up from one patch of the undergrowth closing around Kasia; I whispered “Ulozishtus,” to it, and to another thread of smoke that rose ahead of her, and when I did it to a third, a tiny struggling yellow flame bloomed near her grasping arm.

“Ulozishtus,” I said to it again, giving it another bit of magic, like laying scraps of kindling to a new fire in a dead hearth. The flame grew stronger, and where it touched the vines recoiled, pulling back. “Ulozishtus, ulozishtus,” I chanted, feeding it, building it higher, and as it climbed I took burning branches from it and set the rest of the Wood alight.

Kasia staggered up, pulling her arms free of smoking vines, her own flesh marked pink with the heat. But she could move quicker again, and she came towards me through the smoke, through the crackling leaves, running as the trees went up, as scorching branches fell around her. Her hair was burning, and her torn clothing, tears running down her face as her skin reddened and blistered. Her body before me was jerking in the manacles, writhing in a scream of rage, and I wept and shouted, “Ulozishtus!” again. The fire was growing, and I knew that just as the Dragon might have killed me, purging me of the shadows, Kasia might die here now, might burn to death at my hands.

I was grateful now for the long terrible months trying to find something, anything; I was grateful for all the failures, for every minute I had spent here in this tomb with the Wood laughing at me. It gave me the strength to keep the spell going. The Dragon’s voice was steady behind me, an anchor, chanting to the end of the Summoning. Kasia was coming nearer, and all around her the Wood was burning. I could see very little of the trees now—she was close enough that she was looking out of her own eyes, and there were flames licking at her skin, roaring, crackling. Her body arched against the stone, thrashing. Her fingers stiffened, going wide, and suddenly her veins ran brilliant green in her arms.

Drops of sap burst trickling from her eyes and nose in rivulets down her face like tears, the bright fresh sweet smell horribly wrong. Her mouth hung open in a silent round cry, and then tiny white rootlets crept out from beneath her nails, like an oak-tree growing overnight. They climbed with sudden horrible speed all over the manacles, hardening into grey wood even as they went, and with a noise like ice breaking in midsummer, the chains broke.

I did nothing. There was no time to do anything: it happened quicker than I could even see it. One moment Kasia was chained, the next she was leaping for me. She was impossibly strong, flinging me to the ground. I caught her shoulders and held her off with a scream. Sap was running from her face, staining her dress, and it fell on me with a pattering like rain. It crawled over my skin, beading up against my protection spell. Her lips peeled back from her teeth in a snarl. Her hands closed around my throat like brands, hot, burning hot, and those strangling rootlets began to crawl over me. The Dragon was chanting faster, running through the final words, racing to the end of the spell.

I strangled out, “Ulozishtus!” again, looking up into the Wood and into Kasia’s face, twisting half in rage and half in agony, as her hands tightened. She stared down at me. The light of the Summoning was brightening, filling every corner of the room, impossible to evade, and we looked full into each other, every secret petty hate and jealousy laid open, and tears were mingling with the sap on her face. I was weeping, too, tears sliding from my eyes even as she pressed the air out of me and darkness started to creep in over my sight.

She said, strangled, “Nieshka,” in her own voice, shuddering with determination, and one by one she forced her fingers open and away from my throat. My vision cleared, and looking into her face I saw the shame falling away. She looked at me with fierce love, with courage.

I sobbed again, once. The sap was running dry, and the fire was consuming her. The little rootlets had withered and crumbled to ash. Another purging would kill her. I knew it: I could see it. And Kasia smiled at me, because she couldn’t speak again, and lowered her head in a single slow nod. I felt my own face crumpling and ugly and wretched, and then I said, “Ulozishtus.”

I looked up into Kasia’s face, hungry for one last sight of her, but the Wood looked out of her eyes at me: black rage, full of smoke, burning, roots planted too deep to uproot. Kasia still held her own hands away from my throat.

And then—the Wood was gone.