Who are aryans and what are they?

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Explanation:

At the beginning of the Vendidad or first Parsi Sacred Book series, recognised as Zendavesta, it was said that the supreme god Ahura-Mazda was the nation full of pleasures, however hard of entry. This simplistic nation was so beautiful that the entire animated world would have filled thither and ruined it if it hadn't been challenging to enter. However, this situation did not last long, for the spirit of gloom, Ahriman or Anramainy, was the unrelenting foe of Ormuzd or Ahura-Mazda, the spirit of sun. And with the enemy who deals with death