Vindicate

You touch a creature, and that creature becomes cursed for the duration of the spell. When you cast this spell, choose the nature of the curse from the following options:

• Choose one ability score. While cursed, the target has disadvantage on ability checks and saving throws made with that ability score.
• While cursed, the target has disadvantage on attack rolls against you.
• While cursed, the target must make a mental saving throw at the start of each of its turns (either intelligence, wisdom, or charisma, whichever is highest). If it fails, it wastes its action that turn doing nothing.
• While cursed, you and your party's attacks and spells deal extra 1d8 force damage to the target. (each attack and spell is one instance)
• While cursed, the target can't use spells.

At the end of the target's turn, it takes a mental saving throw (either intelligence, wisdom, or charisma, whichever is highest), if it succeeds, the spell ends.

A remove curse spell ends this effect. At the DM's option, you may choose an alternative curse effect, but it should be no more powerful than those described above. The DM has final say on such a curse's effect.