Indra is invoked to vanquish enemies and bring prosperity, as he is a mighty ally who ensures safety and is never overpowered [rv-10-152-1 ] rv • Book 10 . A protector and subduer, he is urged to slay वृत्र and destroy राक्षसस् , safeguarding his followers [rv-10-152-2 ] rv • Book 10 . Indra is called to defeat foes arrayed against us, cast down enemies into darkness, and secure us from threats [rv-10-152-4 ] rv • Book 10 .