|Canto 8: Withdrawal of the Cosmic Creations||Chapter 11: King Indra Annihilates the Demons|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 8.11.35
vṛtro yena vipāṭitaḥ
anye cāpi balopetāḥ
tapaḥ — austerities; sāra-mayam — greatly powerful; tvāṣṭram — performed by Tvaṣṭā; vṛtraḥ — Vṛtrāsura; yena — by which; vipāṭitaḥ — was killed; anye — others; ca — also; api — indeed; bala-upetāḥ — very powerful persons; sarva — all kinds; astraiḥ — by weapons; akṣata — without being injured; tvacaḥ — their skin.
Vṛtrāsura was the essence of the austerities undergone by Tvaṣṭā, yet the thunderbolt killed him. Indeed, not only he but also many other stalwart heroes, whose very skin could not be injured even by all kinds of weapons, were killed by the same thunderbolt.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness