The Nāfuel are definitely 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, guarding the dēvas of Trāyastriṃśa from assaults through the asuras. The strategic place from the Naga Empire authorized it to work https://128.199.208.170/