Banshee is one of the three skins released in one part of the Moonlight Festival offer. It could be purchased on an individual basis with game coins in late October 2017.
Banshee could be purchased in the Skins Shop under the 'Moonlight' tab for 1900 coins. This skin was available for a limited time and may not be available for purchase in the future.
Details of this skin can vary depending on location, platform or time.
Note: The Moonlight Festival offer was released again for a limited time in mid September 2021. The price for Banshee remained at 1900 coins for this release.