Helm is one of the three skins released under the Battle of the Gladiators part of the Gladiators offer. It was available for individual purchase using game coins in mid July 2017.
Helm could be purchased in the Skins Shop under the 'Gladiators' 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 Battle of the Gladiators sub-offer has been released many times after the initial 2017 debut. The last three limited time releases were in May 2021, August 2021 and then in November 2021. The price for Helm remained at 690 coins for each of these releases.