The Nāfuel would be the followers of Virūpākṣa (Pāli: Virūpakkha), among the list of Four Heavenly Kings who guards the western route. They work as guards upon Mount Sumeru, safeguarding the dēvas of Trāyastriṃśa from assaults through the asuras. As historians and archaeologists uncover more details on the Naga Empire, https://128.199.208.170/