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.

For the duration, when you deal damage to a creature with the weapon used in the spell's casting, you can deal 1d4 slashing damage to up to two other creatures within 5 feet of the target as they are cut by the razor winds released by your attack.

Source: Kibble's Casting Compendium