Xanthar is a relatively new deity that manifested himself after an overwhelming number of mortals cried out for an end to their suffering. Xanthar is the answer to their prayers and pleas, wandering from place to place, healing mortals himself. These selfless acts have inspired many mortals to follow his example, with adherents going wherever mortals need relief.
Xanthar should not be mistaken for Xalthar, who is responsible for killing mortals, not healing them. Nor should Xanthar be confused with Nyubar, who also has a tendency to appear before gravely injured mortals.