Widogast's Web of Fire

You strikes your palms upon the ground, causing a web of flame to crackle out and streak towards up to five creatures you can see within range. The fire then explodes upward into a column of flame. Each target must make a Dexterity saving throw, taking 8d6 fire damage on a failed save, and half on a success. Alternatively, you can cause all five streaks of fire to converge on a single target, intensifying the damage to 12d6 fire damage on a failed save, or half as much on a success. 

The fire can travel over objects up to 5 feet high, but cannot travel through water. Flammable nonmagical objects in the fire's path are ignited.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d6 for each slot level above 4th.

Created by Matthew Mercer and Liam O'Brien - Critical Role