Beltane, the ancient Celtic fire festival marking the beginning of summer, once stood as a powerful turning point in the year—a night of bonfires, fertility rites, and thinning veils between worlds. Though largely forgotten today outside neo-pagan circles, Beltane still echoes through Celtic-inspired fantasy, where it often serves as a moment of magic, transformation, and looming consequence. In this post, we explore the origins of Beltane, how it was celebrated, and why it continues to shape modern fantasy storytelling—including its pivotal role in The Rivers Ran Red and other Celtic-influenced works.