The Nāfuel would be the followers of Virūpākṣa (Pāli: Virūpakkha), one of many 4 Heavenly Kings who guards the western path. They act as guards upon Mount Sumeru, shielding the dēvas of Trāyastriṃśa from assaults with the asuras. At the center on the Naga Empire’s cultural identification was serpent worship. https://128.199.208.170/