Curse of Incompetence

4th-level necromancy

Casting Time: 1 action

Range: 30 feet

Components: V, S, M (a teardrop)

Duration: Concentration, up to 1 minute

Your target momentarily forgets its technical abilities.

Select a creature within range that has an Intelligence of 3 or higher. Your target must make an Intelligence saving throw or be unable to add its proficiency bonus to any ability checks, attack rolls, or saving throws it makes. An affected creature can make a new saving throw at the end of each of its turns, regaining its proficiency bonus on a success.

At Higher Levels. If you cast this spell using a 5th?level slot, the duration increases to concentration, up to 10 minutes. If you cast it using a 6th-level slot, the duration increases to concentration up to 1 hour. If you cast it using a 7th-level slot, the duration is 1 hour.