Orb of Deception (Ahri Q)

You conjure and hurl a shimmering orb in a straight line up 20 feet. Each creature in the path of the orb must make a Dexterity saving throw. On a failed save, a creature takes 2d8 fire damage. On a successful save, a creature takes half damage.

At the end of your turn, the orb returns to you. Each creature in the path of the orb must make a Dexterity saving throw. On a failed save, a creature takes 2d8 force damage. On a successful save, a creature takes half damage.

Using a Higher-Level Spell Slot. The damage increases by 1d8 for both the forward and backwards direction each spell slot level above 3.