World End is one of the four skins released in the Doomsday offer. It could be purchased on an individual basis using game coins in late April 2021.
World End could be purchased in the Skins Shop under the 'Doomsday' tab for 2390 coins. It was available for a limited time and may not return in the future.
Details of this offer can vary depending on location, platform or time.
Note: The Doomsday offer was released again for limited times in September 2021 and then in April 2022. The price for World End remained at 2390 coins for each of these releases.