Seven Days of Nuclear Corrosion

#Worldbuilding

Timeframe: Seven days from late autumn 1999 to the dawn of the new millennium, coinciding with the rare celestial event of seven planets aligning

Setting: An abandoned St. Mary's sanatorium serves as the anchor point, radiating into five cursed ecological exclusion zones

Energy system: Spatial folding is achieved through "miasma cores" (crystallized magnetic fields from decaying organisms), at the cost of gradually eroding the bodies of those who transmigrate

Central conflict: A medical conglomerate attempts to use miasma cores to create an immortality serum, but accidentally opens a spatial passage to a forbidden land