Bright White Chains

Snake-like, white chains fill a 30-foot by 5-foot space on ground in front of you. For the duration, these chains turn the ground in the area into difficult terrain.

When a creature enters the affected area for the first time on a turn or starts its turn there, the creature must succeed on a Dexterity saving throw or take 3d6 piercing damage and be restrained by the chains until the spell ends. A creature that starts its turn in the area and is already restrained by the chains takes 3d6 piercing damage.

A creature restrained by the chains can use its action to make a Strength or Dexterity check (its choice) against your spell save DC. On a success, it frees itself.