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Staggering Smite 4th level evocation

Casting Time: 1 bonus action

Range: Self

Components: V

Duration: Concentration, up to 1 minute

Tags: paladin level4 evocation

The next time you hit a creature with a melee weapon attack during this spell’s duration, your weapon pierces both body and mind, and the attack deals an extra 4d6 psychic damage to the target. The target must make a Wisdom saving throw. On a failed save, it has disadvantage on attack rolls and ability checks, and can’t take reactions, until the end of its next turn.

You can find more information on this spell in: PHB.278