Curse of Reduction

You cause a creature or an object you can touch to be cursed by you, shrinking for the duration. If the target is unwilling, it can make a Constitution saving throw. On a success, the spell has no effect. Everything it is wearing and carrying changes size with it. Any item dropped by an affected creature returns to normal size at once. The target's size is halved in all dimensions, and its weight is reduced to one-eighth of normal. This reduction decreases its size by one category--from Medium to Small, for example. Until the spell ends, the target also has disadvantage on Strength checks and Strength saving throws. The target's weapons also shrink to match its new size. While these weapons are reduced, the target's attacks with them deal 1d6 less damage (this can't reduce the damage below 1). A remove curse spell ends the effect early, as do greater magics. If the material component you used to cast the spell is destroyed, the spell instantly ends.

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, and the target is reduced by 2 size categories (From Medium to Tiny). While tiny, the target's weapons can only deal 1 bludgeoning, piercing, or slashing damage, and their hit dice are changed to d4s. 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, and a spell slot of 6th level or higher requires the use of a Greater Restoration spell or a Wish to dispel the effect.