Syluné's Streaking Meteor

You create a flying sphere of flame which has a radius of 5 feet at an unoccupied space within range, and at any height. It immediately begins its journey by travelling forward in a straight line, travelling in whatever direction you choose.

After the sphere has travelled 60 feet, it turns at a sharp 90 degree angle to the left, right, up, or down (whichever direction you have chosen during casting). Following this turn, it travels another 60 feet in a straight line, before abruptly fading away. You don't need to see the full trajectory of the sphere to direct the sphere.

While travelling, the meteor rebounds directly back if it strikes a large solid object, such as a wall or Huge or larger creature. When a rebound occurs, the meteor tries to continue the remainder of its trajectory. It can rebound any number of times, though each rebound decreases the damage dealt by the meteor by 1d6. A creature struck repeatedly by it as it races back and forth may fail to fully appreciate this weakening.

Upon contact, the meteor automatically ignites all flammable substances and causes each creature it strikes to make a Dexterity saving throw, which must be made each time it is struck if it is hit multiple times. On a failure, a creature is dealt 10d6 fire damage, though this may be lessened by rebounds. On a success, the creature only suffers half damage.