Varus' Chain of Corruption

You fling out a damaging tendril of corruption that travels in a line originating from you that is 100 feet long and 5 feet wide, hitting the first creature or object in that path. A creature hit by the tendril must make a dexterity saving throw, taking 8d8 necrotic damage on a failed save, or half as much on a successful one. In addition, a creature that fails the save is restrained by the tendrils until the spell ends.

Until the spell ends you may use your action to propagate the tendril from the last creature damaged by it, by targeting another creature within 30 feet. The target must succeed on a dexterity saving throw or take 8d8 necrotic damage and be restrained.

A restrained creature can use an action to make a Strength or Dexterity check against your spell save DC. If successful, the creature is no longer restrained by the tendril.