Disaster / Destruction
A group of mortal arcane spellcasters warped reality and the nature of arcane magic in an epic ritual.
The curse was performed by a secret cabal of spellcasters known as the Cult of the Arcane, looking to bend the powers of life and death to give themselves immortality. This created the necromancy school of magic, but also set off a cascade of changes that eventually tore apart the two great empires of the world, and shaped the lives and natures of many races.