This spell targets a group of upto 100 bladed weapons and rounds the edges of their blade to make them blunt. They now do crushing damage instead of piercing damage.
Base 3, +2 voice, +2 sun, +2 group, +1 size, +2 metal
The perfect weapon for the magus going into battle.
you need to check on what makes a weapon "do" damage.
A blunt sword does not do the same damage as a sharp sword but as "crushing" instead of "slashing" damage.
The process was normal in ME, and was called "rebating", and was used to prepare practice weapons.
To be effective like a mace, you need a heavier weapon and one which focuses the impact (typically to a more or less pointed spike or flange)
The spell proably reduces swords to (say) "half damage"
But that is half-damage against your grogs, the enemy's magical swords will no-longer hurt you, as you cast it with little penetration and they bounce off your parma.
I have just searched "Edge of the Spoon", and stand corrected. Grogs will take less damage, but the concencus is that the magus would still be hit by the blunt sword.