Elemental Garrote

Make a melee spell attack against a creature. On a hit, the target is grappled. While the target is grappled in this way, it can not speak above a whisper and it takes 1d4 acid, cold, fire, lightning, or thunder damage (your choice) at the start of each of its turns. The target may escape the grapple if it succeeds a Strength (Athletics) or Dexterity (Acrobatics) check against your spell save DC. 

This spell's damage increases by 1d4 when you reach 5th level (2d4), 11th level (3d4), and 17th level (4d4).