
Weables |

If anything, you could cast it on a group of 50 pieces of ammo. That's the normal way to do this sort of thing (see Flame Arrow, that sort of thing)
That being said, pretty much every effect of this spell requires you to be in melee (+CMB, popping the light vs an adjacent opponent). It's not exactly a solid choice to use with ammo, so I don't see the issue allowing it

Emmit Svenson |
Fifty? Yeesh.
Here’s my thinking. Character casts Mass Dazzling Blades as a swift action on a number of (metal) shuriken equal to caster level. Character then takes free actions to draw those shurikens, make blinding attacks on an adjacent foes, then drop the shurikens. Doesn’t seem like too powerful an effect for a 3rd level spell--you could be Hasting the party, after all--but the awesome thing is you can still take a move or a full round action.
But if you can cast regular Dazzling Blades to get 50 blind attacks, or Mass Dazzling Blades to get 50 x level blind attacks, that seems like too much.