Hello Reaper is one of the three skins released in the Scare Fest offer. It was available for individual purchase using game coins in late October 2020.
Hello Reaper could be purchased in the Skins Shop under the 'Scare Fest' tab for 6500 coins. It was available for a limited time and may not be available for purchase in the future.
Details of this skin may vary depending on location, platform or time.