Brittleness

You touch a creature, and that creature must succeed on a Wisdom saving throw or become cursed for the duration of the spell. a creature cursed by this spell has their AC lowered by 2.

A remove curse spell ends this effect. 

At Higher Levels. If you cast this spell using a spell slot of 3rd level or higher, the duration is concentration, up to 10 minutes. If you use a spell slot of 5th level or higher, the duration is 8 hours. If you use a spell slot of 7th level or higher, the duration is 24 hours. If you use a 9th level spell slot, the spell lasts until it is dispelled. Using a spell slot of 5th level or higher grants a duration that doesn't require concentration.