In Javanese wayang mythology, the ruler of the underworld is the 'Naga' God/(Dragon), whose name is Antaboga.
"Antaboga is the ruler of Saptapratala, the seventh layer of the earth, or the 'underworld',"

Antaboga is also described as a guardian figure in Javanese, Balinese and Indonesia beliefs. This is reinforced based on ancient manuscripts such as the story of the book 'Udyogaparwa, Tantu Panggelaran, and Korawasrama'