explorers' guild: immortals
The immortals are those folk who do not age, and who, barring accident, might live forever. Some have existed as long as Ymra itself. Others had more recent origins. Many immortals are extremely difficult, of not impossible, to kill, unless you know arcane details of their natures and origins. For obvious reasons, immortals often guard these details carefully.
Immortals include the myriad different types of faeries and goblins, the ancient dragons and their kin, and the angels and demons, who walked with the creators of Ymra, and who are the oldest of all the immortals.