Add the Magic Missile spell to your spellbook for free. Your expertise in this spell grants you the following benefits.
Extra Darts
When you cast Magic Missile, you create an extra dart of magical force. You create two extra darts at Wizard level 6, three extra darts at Wizard level 10, and four extra darts at Wizard level 14.
Free Casting
You can cast Magic Missile without a spell slot. You can do so a number of times equal to your Intelligence modifier (minimum of once). You regain one expended use when you finish a Short Rest, and you regain all expended uses when you finish a Long Rest.
Penetrating Darts
Your Magic Missile darts bypass any effect, such as the Shield spell, that specifically blocks the Magic Missile spell.