Aka: Arimanius or Angra Mainya 

Shape : carry the Druj (trap)                    

Rank : Supreme God of Evil                  

Origin : Zoroastrianism 

Myths :  Ahriman is thought to be the first personification of "the Devil", struggling against Ohrmazd  (Good)              

Magic : nine hundred and ninety-nine diseases to plague the earth               

 Association : The 7 archdemons (daevas) are known as Aka Manah, Indra, Sauru, Taurvi, Zairitsha, Naonhaithya, Aeshma.  

Source :  Farvardin Yasht    (Yasht xiii.142; Vendidad xix.5).   

Quote :    

'Arimanius frown'd,
The author foul of evil, how with shades
From his dire mansion, he deform'd the works
Of Oromazes; turn'd to noxious heat
The solar beam, that foodful Earth might parch,
That streams exhaling might forsake their beds,
Whence pestilence and famine...
If the hand of Oromazes, on precarious life
Shed wealth and pleasure, swift the infernal God
With wild excess, or avarice, blasts the joy.
But yet at last, shall Arimanius fall
Before his might, and evil be no more.'

"With the disappearance of evil from the universe, good will prevail everywhere and for all time; and the accursed name of Angra Mainya will be forgotten. Ahura Mazda will be for ever, even as he has been from all eternity" (Yasht xix.11,12).