You infuse the weapon used in the spell's casting with tempestuous power. For the duration, when you make an attack during your turn with the weapon, the weapon used in the spell's casting gains a reach of 30 feet, releasing slashes of razor sharp wind against foes beyond your normal reach; the weapon deals slashing damage when damaging targets beyond your normal reach.
Additionally, the damage you deal with the weapon increases by 1d4, and if there is another creature within 5 feet of the target, you apply the same attack roll to that second creature, dealing half as much damage as the weapon attack on a hit.