A dark elf invented a powerful spell that is the result of hundreds of years of experimentation and understanding the secrets of magic and every aspect of existence. It involves creating a metaphysical swamp that touches not the body, not the mind, not the soul, but the very essence of the being that steps into the swamp. The swamp reaches even the deepest fears, troubles, and doubts that someone possesses and amplifies them. The swamp grows deeper as someone doubts, fears, deceives, and conceals something important within themselves. The swamp extracts and devours the essence of its victim until only an empty shell remains that once teemed with life. Only those who have no sorrows, worries, or doubts or are capable of overcoming them will be able to pass through the swamp.
