Angra Mainyu

Within the Zoroastrian cosmological framework reflected in the supplied sources, Angra Mainyu is presented as the opposing or 'brother' power to the beneficent principle (Spenta Mainyu) and by extension an adversary to Ahura Mazda. Sources describe a dualistic scheme in which two cosmic powers — one creative and beneficent, the other destructive and antagonistic — constitute the core moral and ontological opposition of the religion. Blavatsky and other commentators emphasize the motif of the 'two Brother‑Powers' (Ahura Mazda and Angra Mainyu) as a central allegory in Mazdean thought, while reference works (Wikipedia, Wikidata) summarize the figure as the personification of the destructive spirit.

The supplied material does not provide a consistent traditional physical description of Angra Mainyu from primary Zoroastrian texts. Modern and popular treatments sometimes attach iconographic or imaginative depictions (for example, speculative comparisons with monstrous figures on seals in non‑Avesta iconographic discussion), but the provided scholarly and reference excerpts warn that such imagery is speculative and not part of a stable canonical description. Therefore no authoritative traditional physical form is attested in the cited excerpts.

Across the sources Angra Mainyu's chief attribute is his role as the destructive, adversarial agency opposing the beneficent divine power. He is described as the 'destructive evil spirit' who functions as the main adversary of Spenta Mainyu or Ahura Mazda, and his behavior is framed as cosmic antagonism — a foundational, systemic opposition that organizes moral and cosmic struggle in Zoroastrian thought. The supplied excerpts do not list further specific powers (for example, possession, creation of subordinate demons, or particular acts toward humans) in the primary tradition, and such particulars are therefore not asserted here.