While in the Xanth collection by Piers Anthony, the Naga are a race of human-headed serpents that can renovate in between totally human and serpent forms, which includes any species and dimensions of snake. Phaya Nak or Phaya Nāga (Thai: พญานาค; RTGS: phaya nak; lit. 'lord of Nāga', phaya derived https://mhnaga26.com