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3D Realms has responded to the lawsuit filed by Iron Maiden and their holding company, which focuses on their latest game, Ion Maiden.

The developer responded on Twitter with a curt response, noting their trademark infringement claims are “frivolous” and their game, Ion Maiden, is wholly unique.

“We’ve recently heard about a lawsuit filed in California by the band Iron Maiden, claiming our old-school first-person shooter Ion Maiden is infringing on their trademark,” the studio said.

They added,” From what we’ve heard, the suit claims our main character Shelly Harrison, originally debuting in 2016’s Bombshell, is based on their musician Steve Harris; our skull bomb icon found in-game is based on their skeleton mascot Eddie; our logo in itself is based on theirs; and other frivolous claims anyone who has played Ion Maiden would find more over the top than Shelly’s “Loverboy”, her signature 18-round triple-barreled revolver.”

Lastly, the developer noted they will “review our options once we receive official notice of the lawsuit and will make any necessary decisions at the appropriate time. Regardless, everyone continues to work diligently on Ion Maiden to deliver the best possible experience later this year.”

Iron Maiden and their holding company are seeking $2 million in compensation, as well as 3D Realms ceasing to use their “confusingly similar” product naming.

It remains to be seen how this lawsuit will progress, however Ion Maiden is still available for PC, via Steam Early Access. A console release is planned as well.