Tharn's Greatsword

Summon a spectral greatsword to unleash a large sweep in front of you. Each creature within a 15ft cone must make a DEX saving throw. On a failed save a creature must take 3d8 slashing damage, or half on a save. Damage is considered magical.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d8 for each slot level above 1st.