Asura

Sources record multiple, historically layered accounts rather than a single uniform origin. Linguistically, modern scholarship finds Old Indic asura cognate with Avestan ahura, deriving from Proto-Indo-Iranian *háSura with a sense of 'lord' — an archaic semantic field of powerful lords. In Puranic mythic etiologies one strand explains the name via a-sura ('not sura') tied to the Samudra Manthana narrative (rejection or acceptance of Varuni) as an explanatory folk etymology; certain Buddhist commentarial traditions (e.g., accounts attributed in summaries of Buddhaghosa) describe asuras as a dispossessed group cast down from Mount Sumeru/Trāyastriṃśa, producing a mythic origin of their antagonism to the devas. These variants indicate the term's shift from an older honorific sense toward a socially and morally contested category in later texts.

There is no single stable physical template for all asura in the surveyed sources; as a taxonomic class they are described across literature without a uniform corporeal description (Sources 1, 5). Individual mythic asura receive specific iconography: Rahu is described as the severed head of an asura and in art is depicted as a serpent-like, head-only figure (a 'serpent with no body'), while Ketu is represented as the headless, half-bodied or smoky-bodied entity formed from the asura's remaining body joined with a snake (Sources 3, 4).

Hindu sources characterize asura broadly as power-seeking beings who contest the Deva for influence (Source 1). Buddhist accounts treat asura as demigods or titans of the sensual realm who enjoy more pleasurable lives than humans yet are governed by wrath, pride, envy, and insincerity (Source 5). In specific myths, asura can enact cosmically consequential deeds: the beheading of Svarbhānu produces Rahu and Ketu, who are said to 'swallow' the sun or moon and thus cause eclipses; Rahu is also described in mythic/astrological texts as a master of deception and an agent associated with illusion and sudden changes (Sources 3, 4). Astrological writings attribute to Ketu associations with illusion, detachment, asceticism, and spiritual transformation, but these are interpretive associations within astrological tradition rather than claims about a corporeal ability (Source 3).