Introduction
Saurva is one of the six chief daevas of Zoroastrianism, opposed to the Amesha Spenta Khshathra Vairya, "Desirable Dominion". Where Khshathra Vairya represents rightful, chosen power exercised for good, Saurva represents its corruption: oppression, misrule and power seized or abused.
Zoroastrianism inherited many divine names from the older, shared Indo-Iranian religious tradition ancestral to both Zoroastrianism and Vedic Hinduism, but its strict ethical dualism recast several of these figures as daevas, evil spirits opposing Ahura Mazda and the Amesha Spentas, in deliberate contrast to their positive standing (as Devas) in the Vedic tradition. The six chief daevas each specifically oppose one Amesha Spenta.
Misrule and oppression
Saurva's opposition to Khshathra Vairya frames him as the daeva of bad government and tyranny, the demonic force behind unjust rulers who abuse their authority rather than exercising it as a gift to be used righteously, a concept with clear resonance for a tradition that placed great emphasis on just kingship.
Possible connection to Rudra
Some scholars have proposed a possible etymological or conceptual connection between Saurva and the fierce Vedic god Rudra (a form of Shiva in later Hindu tradition), though this connection is less firmly established than the clearer cognate relationships of Indra and Nanghaithya with their Vedic counterparts.