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You take a hefty -5 attack penalty to every attack that round, similar to Power Attack would do with a high enough BAB. Then with every attack that lands, it would force the opponent(s) to make a Fort save or be stunned. It looks like this would also apply to an AoOs you make too, since it's effects last until the start of your next turn.
So if you did land 4 attacks, they'd have to save against all of them, or as many until they ended up failing one.

Claxon |

If you hit 4 times, yes they would have to make 4 saves.
Keep in mind though voluntarily taking a -5 to hit is kind of a big deal. At least the DC scales well enough since its based on BAB. You start with a DC of 26 and go up to 30.
Thats about the same range as most spell casters. But, you probably still wont have a lot of luck using it against creatures with good fort saves.