Indra has many epithets in the Indian religions, notably Śakra (शक्र, powerful one),
In Rigveda, Indra is described as strong willed, armed with a thunderbolt, riding a chariot:
5. Let bullish heaven strengthen you, the bull; as bull you travel with your two bullish fallow bays. As bull with a bullish chariot, well-lipped one, as bull with bullish will, you of the mace, set us up in loot.