Chains of the Plague Keeper

A creature you can see within range must succeed on a strength or dexterity check vs your spell DC or become grappled. The target may attempt another skill check at the end of each of its turns to break the grapple.  Upon breaking out of the chains the target takes 1d8 necrotic damage.

The damage of this spell increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and level 17 (4d8)