Enfeebling Chains

Inky black chains erupt from the ground beneath your enemies ensnaring them in a web of psionic energy. Make three ranged spell attacks against one or more creatures within range. On a hit, the target takes 3d6 physic damage and is restrained until the end of its next turn. 

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, you make an additional attack for each level above 4th