Because of their ways of peace the Fairy people saw them as an ideal candidate for their chosen race to assign tasks to when they were not allowed to intervene,and so they bestowed upon them the gift of immortality through their magic.This regenerative process involved a fairy actively removing the dying elf's mind and holding it in the Magic carrier wave as psychic energy,they then repaired the damage to the body using yet more magic then returned the mind to the body.This was not true immortality but rather the great power of the fairy's magically assisted medicine.