The Land of Alstia
Lachesis was the Immortal sorceror king who ruled the land of Lux before the Tenebrae war. Lachesis was a wise and powerful king, and under his guidence the kingdom prospered for over 400 years.
However, towards the end of the empire, Lachesis became more and more reclusive, and one day when his attendents went looking for him, he had simply vanished.
No one knows for sure if he is alive or dead, or why he disappeared. any detailed answers to those questions are myths and gossip.