Voodoo

This practice allows the caster to place in invisible curse on a target of their choice. The caster must either possesses something of personal value to the target, have pre-made a doll-like effigy of the target, or be able to see the target at the time of casting.  

Upon casting a Voodoo curse, the target suffers a disadvantage to the attribute checks and saves with any single attribute selected by the caster.  The target is allowed a saving throw vs. the curse at the time of the casting, but the save will be performed by the game master in secret.  The saving throw will be with the same attribute that is being cursed.

If the curse is being cast from a distance, it will last until the sorcerer takes their next short rest, the caster is incapacitated, the caster removes it, or the target dies.  If the caster uses a personal item or doll while casting the curse, they can reestablish the curse (after resting) on the same target without having to see them again.  No one can cast another Voodoo curse until the first curse is removed.  The curse is an invisible attack and many suffering from one never know it.  A voodoo curse can be revealed with detect magic and removed with a dispel magic spell.  No target can have more than one Voodoo curse on them at a time.  The effects do not stack with other debuff magics.  If a voodoo curse is removed the caster knows immediately.  A Voodoo curse can be cast as a bonus action or ritual spell.