The burning chains of Koharth

You extend your palm toward a target that is within 10 feet of yourself and shoot out a red hot chain. When the spell is cast the target must make a dexterity saving throw. On a failed save the target is restrained and takes 1d4 fire damage every turn until it breaks free.

A creature restrained by the chains may use its action to make a strength check against your spell save DC. On a successful save, the creature ends the effects on it.

When you cast this spell using a spell slot of 4th level or higher, you can target an additional creature for each slot level above 3, max amount of targets is 4 if you  use a 6th level slot.