Negate

Negates is a type of saving throw. The others are half, partial, and disbelief. (So far, only disbelief seems to be an Arcane Phantasmal Killer.)

If a spell has a saving throw type of negates than if the target is successful with his saving throw then it suffers no ill effects. The target still knows that a spell has been cast on it, but takes no damage and isn't paralyzed or charmed, etc.