Bane

1st-Level Enchantment Spell (Bard, Cleric, Warlock)

Casting Time: Action
Range: 30 feet
Components: V, S, M (a drop of blood)
Duration: Concentration, up to 1 minute

Up to three creatures of your choice that you can see within range must each make a Charisma saving throw. Whenever a target that fails this save makes an attack roll or a saving throw before the spell ends, the target must subtract 1d4 from the attack roll or save.

At Higher Levels: You can target one additional creature for each spell slot level above 1.

Source: Player's Handbook, p. 245