Blast Off

A blast of energy erupts in a line 60 feet long and 10 feet wide, originating from a point you can see, and aimed in the direction you choose. The energy blast mimics the visual of rocket thrusters blasting off. Each creature in line must make a Dexterity saving throw. On a failed save, a creature takes 4d8 fire damage, or half as much on a successful save.  

If you roll a 1 or 8 on any damage die, you can roll one additional 1d8 and add its damage to the total. Additionally, a creature that fails its saving throw is pushed back 5 feet for every die that rolled a 1 or 8.