Trailblaze

A vertical crescent wave of flame energy blazes in a line from yourself, the first two creatures in this line make a dexterity saving throw, the first target to fail takes 1D6 fire Damage and the second failure takes 1D4 fire damage. The spell then immediately ends.

 At 5th Level the line can target a further individual. The first target to fail takes 1D8 fire damage, the second 1D6 fire damage and third to fail takes 1D4 fire damage (if they all fail).

An additional creature can be targeted at 11th and 17th level with 1D10 and 1D12 added to the front of damage line respectively.