Devitalize

You restrain blood flow through a creature’s body causing it to feel weak. One creature you can see must make Constitution saving throw. If a target fails, whenever they make an attack roll, ability check or saving throw before the spell ends, they must roll a d6 and subtract the number rolled.

At Higher Levels. When you cast the spell using a 5th or 6th level, you can maintain concentration on your spell for up to an hour. When you use a spell slot of 7th or 8th level, you can maintain concentration on the spell for up to 8 hours. If you use a 9th level spell slot you can keep concentration on the spell for up to 24 hours.