Prompt: Cover Image Description: Against a dark and ominous backdrop, a massive ancient hospital door stands wide open, shrouded in eerie mist. The dilapidated sign on the hospital wall faintly reveals the words \"De Ren Sanatorium.\" Ancient trees on either side of the entrance cast elusive shadows, evoking an ancient and mysterious atmosphere. A corner of the doorway emits a crimson glow, resembling a pair of blood-red eyes gazing into the silent night. Through the glass windows inside the hospital, glimpses of a dimly lit corridor can be seen, with vague silhouettes moving about in the subdued light. The entire cover image is veiled in a faint bluish hue, creating a mysterious and oppressive ambiance. The title in the center is written in ancient font: \"Sanctuary of Shadows,\" accompanied by a subtle glow of ghostly blue flames, adding a touch of mystical and haunting atmosphere to the scene.