Cutting Aether

You gather energy and command it to cut whatever foe stands in your way. When you cast this spell, you gain three charges which can be used to slash with an invisible force. As an action, you may spend one of these charges. One creature up to ten feet away from you which you are aware of must make a Dexterity saving throw. The target takes 2d6+ your spellcasting ability modifier force damage and half on a successful save.

When you cast this spell while there are still unspent charges, they are then discharged before gaining any more.