Thunderstrike

By summoning forth your energy into your legs for speed and your blade for power, you are able to make a stroke of your weapon so fast it appears that you simply flashed past your opponent.  Make a melee attack on any target within your movement range; if the attack hits, add 2d6 force damage to your strike.

At Higher Levels.  by casting this spell at higher levels, every character level higher adds 1d6.