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there was eight hammers (plus Deadpool's one) in the the Fear Itself event
Thanks!! Searching about it now, it seems like there are several Fear Itself comics with different characters. Do you know the specific comic?
Cowboys vs Samurai
The one you probably want is simply named Fear Itself. With that said, the plot is the same in all of them. Or rather, they show different sides and perspectives of the same event, so the hammers dropping on Earth is the event which all of them are about.
But again, you probably want the main series, simply called Fear Itself.
I read it years ago and all I can remember is that multiple versions of Thor's hammer dropped on earth and Hulk Mabye got one