Whirlwind of Daggers

You throw between four and eight daggers high into the air, where they multiply before becoming a whirlwind of daggers in a 30ft radius sphere centered on a point you choose within range. When you cast this spell and at the beginning of each of your turns, you may make an attack with each dagger as though you were making a melee attack against a creature within the sphere. You can't make more than eight attacks this way in a single turn. At the end of each of your turns, you may move the whirlwind of daggers up to 30ft in any direction, so long as it stays within range. If you ever move such that the whirlwind is outside the spell's range, the spell ends.

When the spell ends, the daggers drop to the ground and the duplicates dematerialize.