2D platformer game background, side-scrolling view, flat composition. A dark fantasy subterranean ruined chapel-observatory. Foreground: broken gothic columns with bas-reliefs of saints, shattered statues, glowing indigo crystals on the floor. Midground: central low stone altar with a water basin reflecting stars, cracked walls with faded frescoes of star charts and sailing ships. Background: collapsed stone ceiling, cold blue light rays piercing from cracks above. Misty atmosphere, dust particles. No perspective, no vanishing point, purely horizontal layers. Art style: dark fantasy oil painting, inspired by Hollow Knight and Blasphemous, moody chiaroscuro, muted colors with cold blue-violet crystal glow. Wide shot, 2D game level background.