Curse of Agony

You launch an vile curse a creature, and that creature must succeed on a Constitution saving throw or become cursed for the duration of the spell. At the beginning of the cursed targets turn the creature takes 1d6 necrotic damage and it's movement speed is halved for the pain is unbearable. On a successful save the creature cannot be infected by this curse again till  168 hours have passed. 

A remove curse spell ends this effect.

At Higher Levels. If you cast this spell using a spell slot of 4th 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.