Whispered Blade

After conjuring this spell a white, mystical blade of the same size as your dagger will appear in the air. This weapon is controlled by the movements of your own blade and reacts exactly as you move. The blade in question does 1d12 piercing damage and and extra 1d4 damage against the undead. The combined factors of its range and its extreme stealth (it makes no sound gliding through the air or coming into contact with an object) make it an ideal assassination spell. It can be blocked by a wisdom save on its first attack and on its second attack (if necessary) it can be evaded by a dexterity saving throw.