I'm still new to the game and to (Crpgs in general), but I just got Aloth and I'm looking through his spells and one of the spells (Minoletta's Minor Missiles) effect is "Target 13-22 Crush/Corode vs Deflection (+10 Accuracy)"

 

Does it mean your caster gets +10 Accuracy when casting the spell or does it mean the enemy gets +10 accuracy when the spell hits them.

What does the "vs" mean in effects?

 

It means you casting this spell with +10 to your base accuracy.

VS means the stat against which your spell used.