Atrophy

Choose a creature within range. You attempt to cause that creature's muscles to begin wasting away. The creature must succeed on a constitution saving throw or take 1d4 necrotic damage and have its speed reduced by 10 feet. A creature affected by this spell can make another constitution saving throw at the end of each of its turns. For each failure its speed is reduced by an additional 10 feet and it takes 1d4 necrotic damage. If the creature's speed is reduced to 0, it is restrained until its speed is above 0 and the necrotic damage increases to 2d4 on each failed save. On a successful save, the spell and effects end for the creature.

At higher levels. When you cast this spell using a spell slot of 2nd level or higher, you can target one additional creature for each slot level above 1st. The creatures must be within 30 feet of each other when you target them.