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It is not that I cannot create anything good, but that I will not.
~ Angra Mainyu about his hatred of creating anything good and thus choosing to be evil, before he creates a peacock just to make a point.
I have fouled the world with filth and darkness, and made it my stronghold. I have dried up the earth, so that the plants and animals will die, and poisoned Gayomart, so he will die.
~ Angra Mainyu ranting about the chaos he has caused in the Earth.
Angra Mainyu (also known as Aŋra Mainiiu), also called by his Middle Persian name "Ahriman", is the main antagonist in Zoroastrianism. He is the powerful god of evil, destruction, and darkness. He is the Zoroastrian equivalent of Satan and the Anti-God.
In the beginning of time, when Ahura Mazda created all the good things in the universe, Angra Mainyu, out of jealous spite, sent demons to spoil all of creation. Ahura Mazda welcomed his brother benevolently and with words of peace, but Angra Mainyu spurned him, and so Ahura Mazda casted the evil destroyer back into the darkness from whence he came. Ahura Mazda then said "Neither our thoughts, teachings, plans, beliefs, words, nor souls agree.".
After Gayomart, the first human was created, Angra Mainyu, banished to the outer darkness by prayer, attacked creation and spoiled the paradise with starvation, famine, lust, disease, sickness, suffering, and death, defiled everything he touched with rejoice. He then shouts in victory, "I have fouled the world with filth and darkness, and made it my stronghold. I have dried up the earth, so that the plants and animals will die, and poisoned Gayomart, so he will die.".
This infuriated Ahura Mazda, who imprisoned his brother in the Absolute Darkness, from which he could not escape to continue his spoil upon the world. But the unholy god did not concede and lured the first human couple, Mashya and Mashyana, into evil. This forced Ahura Mazda into making them mortal. Angra Mainyu seduces people into wickedness.
During Frashokereti, the Iranian end of the world, Ahura Mazda will bring prepare to destroy Angra Mainyu. But after the humans are no longer enticed by sin and self-indulgence, Angra Mainyu will be pursued by Az, Ahriman's female counterpart. He will beg to Ahura Mazda for mercy. Ahura Mazda will cast the wicked god from creation through the abyss from where he first came from, never to be seen again.
Angra Mainyu rules over the Daeva. He has numerous assistants who help him fulfill his role as Evil Spirit. The main ones are Akoman (Evil Mind), Indra Vayu (Death), Saurva (Disease), Aeshma (Violence and Fury), Az (Lust, Greed, and Jealousy), Mithandruj (Dishonesty and Lies), and Taurvi and Zairicha, also known as Tauru and Zairi (Fever and Thirst).