Secret ritual in the dungeon

A clandestine ritual in a vast underground cavern lit by floating orbs of green witchfire, a hooded sorceress in tattered black robes with arcane tattoos summoning a spectral wight from a pool of bubbling shadow-water, skeletal hands emerging amid swirling runes on obsidian walls. Chains and forgotten altars scattered, faint echoes of chants, her face half-hidden by a mask of bone. Mood of dark sorcery and foreboding, eerie green hues, misty vapors. Gothic fantasy realism, high contrast shadows, 8k, reminiscent of Brom's dark illustrations.