Eldritch Boomerang

You create a boomerang made of pure magical energy which you throw at a creature within range. When you cast the spell, you can make a ranged spell attack at that creature. On a hit, the target takes force damage equal to 1d8 plus your spell-casting ability modifier.

On a miss, the boomerang returns to you, following its initial course. Each creature in the line must make a dexterity saving throw against your spell save DC, taking half damage on a success. The spell ends if a creature fails this saving throw, or if it hits the initial creature. If the boomerang makes it back to you without hitting any creatures, you must make a dexterity saving throw against your own Spell Save DC with a +3 bonus to the roll. On a successful save, the boomerang continues going behind you for an additional 20 feet. On a failed save, the caster takes half damage and the spell ends.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d8 for every slot level above 2nd. Starting at 4th level, creatures that fail the saving throw or are hit by the spell's attack roll are stunned for until the end of their next turn.