Bane

Level: 1

Casting Time: 1 action

Range: 30 feet

Duration: Concentration, up to 1 minute

Up to three creatures of your choice that you can see within range must make Charisma saving throws. Whenever a target that fails this saving throw makes an attack roll or a saving throw before the spell ends, the target must roll a d4 and subtract the number rolled from the attack roll or saving throw.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, you can target one additional creature for each slot level above 1st.

Source: PHB, page 216. Available in the SRD.