History of Isolde

The Great Fey Migration started when the city of Melonor was ripped from its place in the Feywild into Isolde.

The Undead Cataclysm was a period when undead hordes overwhelmed Isolde, spreading like a virus, and nearly annihilating the world's population.

In an instant, two-fifths of the population of Isolde was plane-shifted into the Underdark, each altered by the process.