The Nāfuel would be the followers of Virūpākṣa (Pāli: Virūpakkha), one of several Four Heavenly Kings who guards the western route. They work as guards on Mount Sumeru, preserving the dēvas of Trāyastriṃśa from assaults via the asuras. In Thailand and Java, the nāga is usually a rich underworld deity. https://128.199.208.170/