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The Aen Seidhe and the Aen Elle elves were once one folk, the Aen Undod. Then came a cataclysm, no one knows its nature. The Aen Undod were forced to leave their world. They split along the way. |  | |
| - Yennefer of Vengerberg to Geralt of Rivia, The Witcher 3: Wild Hunt | |||
The Aen Undod were a race of elves who existed long before the Conjunction of the Spheres. Facing cataclysmic annihilation of an unknown kind on their homeworld, many Aen Undod departed and began to search for new worlds. Their descendants split into two distinct groups, the Aen Elle and the Aen Seidhe, of which the latter would go on and migrate to the Continent. The Aen Undod spoke the oldest dialect of elven Elder Speech, Laith aen Undod, or One Speech.