Chains of Justice (5e Spell)
From D&D Wiki
|Casting time:||1 action|
|Duration:||Concentration, up to 1 minute|
Used by Imperial Wardens to capture their targets, this spell conjures moving, golden chains fill a 20-foot square on the ground. 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 2d6 bludgeoning 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 2d6 bludgeoning damage.