Desert Worm is one of the many skins released in the monthly Titans Skin Collection. It could be purchased as part of an item deal in late March 2020.
Desert Worm could be purchased for $4.99 in a limited time deal which included a package of 5000 coins. It was not available for individual purchase and may not be available for purchase in the future.
Details of this skin may vary depending on location, platform or time.
Note: Desert Worm might be a homage to the sandworms of the film Dune (1984).