Curse of Weakness 2014

Ghastly energy flickers within a 10-foot radius sphere centered on a point you choose within range. When a creature starts its turn in the area or moves into the area during its turn, it must make a Constitution saving throw.

On a failure, a creature is cursed with weakness until the end of its turn. While cursed, it has disadvantage on Strength checks and Strength saving throws, it deals half damage with weapon attacks that use Strength, and its speed is reduced by 10 feet.

When you cast this spell using a spell slot of 3rd level or higher, the radius of the sphere increases by 5 feet for each slot level above 2nd.