Dread Enfeeblement

A coruscating ray springs from your hand. Make a ranged spell attack against the target. On a hit, the subject takes a penalty to Strength equal to 1d6+1.
The subject’s Strength score cannot drop below 1.

At the end of each of the target's turns, it can make a Constitution saving throw against the spell. On a success, the spell ends.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the Strength penalty increases by 1 for each slot level above 2nd.