They only have the options listed in the codex. Other than that, there are few formations and legacies of ruin. I'm gonna go out on a limb and assume that's what you have read about. Those are from a different book, Imperial Armour: Volume 13, which isn't sold anymore.
You can think of legacies as relics for vehicles, some of which are god themed. There are no marks for helbrutes though.
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