Dormund's Thread

 A Radiant magical thread streaks towards a target within range and pierces into them with searing light. Make a ranged spell attack against the target. On a hit, the target takes 3d6 Radiant damage immediately.

At Higher Levels: When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for each slot level above 3rd.

• If cast at 4th level or higher the creature must succeed on a Strength saving throw or be restrained by the entangling thread until the end of your next turn. The Creature restrained by the thread can use its action to make a Strength check against your spell save DC. On a success, it frees itself.
  When the spell ends, the thread burns away into embers.