This is the 10009th most frequent Russian word.
арийских
"Арийских" means "Aryan" (adjective, relating to Aryans).
In this sentence, 'арийских' is used as an adjective describing 'мифов' (myths), indicating their relation to the Aryans.
Арийских мифов сохранилось очень мало в сравнении с другими культурными традициями.
Very few Aryan myths have been preserved compared to other cultural traditions.
Here, 'арийских' describes 'поселений' (settlements), showing possession or relation to the Aryans.
На выставке представили реконструкцию арийских поселений.
A reconstruction of Aryan settlements was presented at the exhibition.
In this instance, 'арийских' is used as an adjective modifying 'символикой' (symbolism), indicating the cultural or ideological relevance to Aryans.