Angra mainyu
aka: Ahriman

In Zurvanism, Angra Mainyu is the first son of Zurvan and he create and rule the world, but Ahura Mazda is sent to fight with him for the world.

in Zoroastrianism, Angra Mainyu is the god of darkness, the eternal destroyer of good, personification and creator of evil, bringer of death and disease. He is also known as Ahriman, and his name means "fiendish spirit".

He is seen as the personification of evil, he leading the dark forces against the hosts of Spenta Mainyu, the holy spirit, who assisted Ahura Mazda, the wise lord, and final victor of the cosmic conflict. Ahriman introduced the frost in winter, heat in summer, all manner of diseases and other ills, to thwart Ahura Mazda, and he also created the dragon Azi Dahaka, who brought ruin to the Earth.

Ahriman lives in darkness, in a place where all those who do evil go to after their demise (Hell) and his symbol is the snake. He is what in Christian religion can be called Satan.

Angra Mainyu is the sorcerous spirit which takes many forms, but commands and creates other malicious shades which counteract the stasis-embodied concepts of Ahura Mazda.