Web of Fire

4th-Level Evocation
Casting Time: 1 action
Range: 60 feet
Components: VSM (a cat's cradle of thread or a string coated in phosphorus)
Duration: Instantaneous

A web of flame crackles out around the caster and five streaks of fire rapidly snake along the ground toward up to five enemies the caster can see within a range of 60 feet, exploding into a column of flame upon reaching them. Both the caster and the targets must be touching the ground. Each target must make a Dexterity saving throw, taking 7d6 fire damage on a failed save, or half as much damage on a successful one.

Alternatively, all five streaks of fire can instead converge toward a single target, dealing 10d6 fire damage on a failed save, or half as much damage on a successful one.

The fire can travel over obstacles up to 5 feet high, and ignites flammable objects along its path that aren't being worn or carried.

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, or by 2d6 for each slot level above 4th if used against a single target.

Source: Critical Role

Changelog

Altered separate target damage to 7d6 instead of 8d6 and single target damage to 10d6 instead of 12d6.
Altered upcasting option to increase by 1d6 for each slot level if used against separate targets, or 2d6 for each slot level if used against a single target.