The Age of Blue Fire is not a time, but a state of existence—a cosmic epoch where the fabric between parallel medieval worlds becomes tenuous and fragile. For millennia, scholars have spoken of the Law as a myth, a cautionary tale from the Celestial Chronicles. It dictated that when two civilizations, each rooted in a different iteration of a medieval era, came into contact, their realities would violently merge. This convergence, known as the Collision, is heralded by the eruption of mysterious blue flames from the earth, a phenomenon that burns the ground and distorts local magic. No one knows who wrote the Law, or even if it was written. Some believe it to be a natural force, like gravity for realities. Others whisper that it is the will of forgotten gods who revel in mortal struggle. What is known is its absolute verdict: coexistence is impossible. The cultures, technologies, magics, and the very souls of the colliding peoples are too dissonant. The worlds reject each other.