Craft a magnificent stained glass window reflecting a medieval fantasy theme, suitable for a grand castle's chapel. The design should center around a mythical creature, such as a dragon or a griffin, symbolizing strength and valor. Surrounding the creature are elements of a mystical forest, with unicorns and enchanted trees, all within a medieval tapestry style border. The color palette should be bold and vibrant, with emerald greens, ruby reds, and sapphire blues. Gold and silver accents should highlight the intricate details. The sunlight filtering through should enhance the magical feeling, casting colorful reflections that bring the scene to life. The window's design is in a wide 16:9 aspect ratio, showcasing the full glory of the mythical narrative.
