Night like a black cloak spread over the moor below Shingle Mountain. The air was thick with the scent of resin, wet peat and something remotely wild, which gave no peace to anyone who wandered in. Grzesiek, Ada and Igor, three friends from a nearby town, decided that night to cross the old trail trodden by hunters and go deep into the moor, where it was said to be hidden, as the oldest inhabitants whispered. The moon was pushing through the tattered clouds, casting a pale light on the overgrown path. - 'You said someone saw footprints by the river yesterday, didn't you? - Ada asked, adjusting her hood to hide her shivering. - 'Yes, my grandfather claimed they were huge, as if something we don't know had passed through,' replied Igor, looking at the dark silhouettes of the trees. Grzesiek, who always had a head full of ideas, took an old torch out of his rucksack and moved ahead. The branches crackled under their feet and the heather reached almost to their waist. The fog grew thicker with every step. Suddenly, from over the hill, a deafening sound came to them - something like a hooting, mixed with the rustling of leaves. Ada stopped abruptly. - Did you hear that? - she asked in a whisper. They fell silent. The world seemed to hold its breath. Strange shapes began to appear in the gloom: low, pot-bellied willows, lichen-covered boulders and, among them, a small clearing with a winding path leading to the centre. In the middle of the clearing stood a stone circle, covered with runes older than the oldest legends. Igor approached cautiously, mirroring the ground. Between the stones, something flashed in the grass. Grzesiek picked up an object from the ground: it was an old silver talisman, engraved with the sacred patterns of Slavic families. Suddenly, the ground beneath them trembled, and a cold mist rose from the swamps. In the distance, there was a dragging chant that was neither human nor animal. For a moment, it seemed that silhouettes emerged from the darkness, too tall for humans, with heads covered with deer antlers. All three held their breath as they watched the figures approach slowly, a light shining in their hands, the source of which they could not discern....