# Indra’s Enemy, Vritrasura Angered by Visvarupa’s death, Tvasta (his father) performed a sacrifice in which he chanted a mantra to increase the strength of Indra’s enemies. The mantra, however, was chanted incorrectly, and instead caused Indra to increase in strength. Thus, the sacrifice produced a fierce demon (*asura*) named Vritrasura, of whom Indra was the formidable enemy. Since the demon covered all the planetary systems he was known as *vrtra*, or ‘one who covers everything.’ Though the demigods attempted to annihilate him, Vritrasura effortlessly swallowed up all their weapons and equipment for fighting. Frustrated, confused, and seeing no other recourse, the demigods approached the Supreme Lord, knowing that only His guidance would deliver an ultimate solution. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://bhagavata.keshavaswami.com/canto-06/e.p.i.c/i-indra-and-vritrasura-7-13/indras-enemy-vritrasura.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.