Arcane Blade

You brandish the weapon used in the spell’s casting and make a melee attack with it against one creature within 5 feet of you. This attack ignores any AC and other effects from the Shield, Mage Armor,  and Shield of Faith spells. If this attack causes a creature to make a Concentration Save, increase the DC of its Concentration Save by your Spellcasting Modifier.

At Higher Levels. At 5th-level the melee attack deals an extra 1d8 Force damage. This damage increases by 1d8 again at 11th level (2d8) and 17th-level (3d8).