Silent Fox is one of the three skins released under the Ninjas vs Robots offer. It was available for individual purchase with game coins in early September 2017.
Silent Fox could be purchased in the Skins Shop under the ‘Ninjas x Robots’ tab for 690 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 Ninjas vs Robots sub-offer has been released many times after its initial debut in 2017. The Silent Fox skin was available for 690 coins for every release.