Cursed Amulet in a Damp Castle Dungeon

Watercolor painting in a damp medieval castle dungeon. A tarnished dark-metal amulet with an eerie glowing green glyph sits on a slick flagstone floor, its cracked ruby eye faintly glowing. A rusted chain trails across mossy stones, while rough grey dungeon walls loom in the background with dripping water and puddles reflecting a flickering wall torch. Use wet-on-wet watercolor technique with soft edges and color bleeds; cool blues and greys for the stone, warm amber and ochre from torchlight. The atmosphere is eerie and supernatural, with faint silhouettes of forgotten prisoners lurking in the shadows as a chill fog drifts along the ground.