Once in a realm of ancient forests and untamed magic, Sir Gallahad, a noble knight, ventured deep into the enchanted woods. The air was thick with the scent of elderberries and the calls of otherworldly birds. As twilight settled, Gallahad stumbled upon a hidden, moonlit clearing. Within the clearing stood a shimmering silver Unicorn with a gleaming spiral horn adorning its forehead. As the knight cautiously approached, the mystical creature, aware of Gallahad's pure heart, unflinchingly allowed him to pet its silken mane. An unspoken bond formed, and the other creatures of the forest revealed themselves, acknowledging the knight as an honorary protector of their magical realm. And so, Sir Gallahad's journeys grew evermore entwined with the enchanted worlds of forgotten lore.
Write a brief story describing an encounter between a noble knight and a mystical creature in a magical forest.