Fire Golem is one of the three skins released under the monthly Dark Dimension Zone offer. It could be individually purchased with game coins in early October 2018.
Fire Golem could be purchased in the Skins Shop under the ‘Dark Zone’ 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 may vary depending on location, platform or time.
Note: The Dark Dimension Zone offer with the Fire Golem skin was released again for a limited time in early November 2020. The cost for Fire Golem remained at 690 coins for this release.