Fate of the Arcano-Science War
The Leyline Nexus Points
Although Earth-S is a world of Science and not magic, it has always had some arcane energy. In centuries past this energy was at a high level, but it has been receding at an ever accelerating rate for over 600 years. Some have hypothesized that the radical advances of the Science Corps were made possible in large part by the level of arcane energy shrinking to incredibly low levels, and that we were mere decades from arcane energy disappearing all together.
On M-Day when the portal to Earth-M opened the magical energies of that world surged into Earth-S and reignited the dormant spark of magic. Spells and rituals that had faded into mere traditions suddenly began to work, mere antiquities regained their power as artifacts, and dormant magical beings awoke. Magic could not be awoken all at once however, and the most powerful reawakening has been at the nexus points of the most powerful leylines. For the time being these are the only places of high magical power, but all evidence points to arcane influence spreading out from these nexus points to ever larger areas of the globe.