Aqua is one of the four skins released under the Titan Wars offer. It looks like a giant wave of water with some crumbling islands and a face. Aqua could be purchased individually using game coins in November 2016.
Aqua could be purchased in the Skins Shop under the ‘Titan’ tab for 1990 coins. This skin was available for a limited time and may not be available for purchase in the future.
Note: The Titan Wars offer with the Aqua skin was released again for a limited time in early March 2018. The price for Aqua was the same at 1990 coins.
Details of this offer can vary depending on location, platform or time.