Brimstone Blast

Prerequisite

eldritch blast cantrip

Description

As a bonus action, you cause the faintest scent of sulfur to exude from your palm. The next time you cast eldritch blast, each of its attacks deal fire damage instead of force damage. Each target hit by these attacks ignites in flames for up to 1 minute. At the start of an ignited target's turn, the target must make a Constitution saving throw. On a failed save, it takes 1d6 fire damage. On a successful save, this effect ends. If the target or a creature within 5 feet of it uses an action to put out the flames, or if some other effect douses the flames (such as the target being submerged in water), this effect ends.
You lose the benefits of this eldritch invocation if you use a different eldritch invocation that changes the damage type of your eldritch blast before you cast the cantrip.