Tome's Arcane Ward

You create a magical ward that protects one creature or object from being affected by any spell of 3rd level or lower from a chosen school of magic. For the duration, the first incoming spell targeting the protected creature or object has no effect if the incoming spell is of the same school of magic that the ward protects against. Once this happens, the ward expires. A creature or object can only be protected by one arcane ward at a time. 

When you cast this spell using a spell slot of 4th level or higher, the ward will repel spells of spell level less than or equal to the spell slot used to cast this spell.