The Crystal Isles Ark is known for it's stunningly beautiful visuals, vibrant colors and large vareity of creatures. 
Wild crystal wyverns can be tamed using crystal or primal crystal or by stealing an egg from the wyvern's nest in the desert.
There are Blood, Ember and Tropical crystal wyverns. There are only heir crystal wyverns in the nest which are untameable.
Aberrant creatures can only be found at the element veins in the snowy mountains and the floating islands. Nowhere else.