Elven Noble is one of the three skins released in the first part of the Troldir's Mystic Shop offer. It could be purchased as part of an item deal in early March 2018.
Elven Noble could be purchased for $14.99 in the limited time "Best Deal!" which included 25000 coins and 1800 DNA. This skin was not available for individual purchase and may not be available for purchase in the future.
Details of this skin may vary depending on location, platform or time.
Note: The first part of the Troldir's Mystic Shop offer was released again for a limited time in mid May 2020. The price and included items for Elven Noble remained the same.