Spellplague

After the Goddess Shar and the God Cyric conspired to, and killed the Goddess of Magic Mystra, the Weave, an invisible force from which all magic flows errupted in magical chaos that reverberated through Toril and ravaged the planet. Every being and the planet itself was affected somehow. People, monsters and animals were scarred and mutated, and entire parts of the planet disappeared or fractured. It even drew parts of Toril’s twin world, Abeir back and infused the two planets in some places. Now the face of Toril and Faerun has been irrevocably changed. Roads have been erased, and entire cities and races destroyed. Nearly one hundred years have past since the Spellplague began, and its effects can still be seen.

Spellplague

The Tides of Shadow DM_Spiral