Crossfire Blast

You choose a point within range to burst into flames. These flames extend as a cross of four lines originating from that point, each 10 feet long and 5 feet wide, angled 90° from one another. Each creature in the area must succeed on a Dexterity saving throw or take 2d6 fire damage on a failed save, or half as much damage on a successful one.

When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 1st and the length of the lines increases by 5 ft., up to a maximum of 30 ft. per line for each slot level above 1st.