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It’ll probably be grendels alt helmet now. In the update notes it says that the alt helmet’s have been added except for grendels one.
Added Lavos Cordatus, Mag Gauss, Protea Mavv, Protea Telema, and Xaku Kintsu Helmet Blueprints to the Nightwave Store rotation.
Good catch - we're working on a fix to update the Nightwave Store rotation to include the Gauss Mag Helmet & Grendel Glutt Helmet! The change will need a Hotfix, expect it in the near future.