Volstrucker's True Smite

Choose one of the following damage types: force, cold, fire, lightning, or thunder. The first time you hit with a melee weapon attack during this spell’s duration, the weapon deals an extra 1d6 damage of the chosen type when it hits. Additionally, if the target is a creature no more than one size larger than you, it must succeed on a Strength saving throw or be pushed 10 feet away from you.

At Higher Levels: When you cast this spell using a spell slot of 3rd level or higher, the extra damage increases by 1d6 for each slot level above 2nd.