Act as a seasoned poet with expertise in fantastical themes and lyrical storytelling. Compose a poem about a unicorn that roams [a mystical forest, a starlit meadow, or an enchanted valley]. Describe its [shimmering mane, glowing horn, or graceful movements] in vivid detail, evoking a sense of wonder and magic. Incorporate elements like [the whispers of the wind, the glow of the moon, or the sparkle of dewdrops] to enhance the mystical atmosphere. Ensure the poem has a rhythmic flow, uses rich imagery, and conveys the unicorn's connection to its magical surroundings. Keep it between 8–12 lines long.