Beshadowed Blast

Prerequisite

eldritch blast cantrip

Description

As a bonus action, you cause unnatural shadows to drape your hands. The next time you cast eldritch blast, each of its attacks deal necrotic damage instead of force damage. Choose one creature hit by these attacks to make a Constitution saving throw. On a failure, the creature is blinded for up to 1 minute. At the end of each of the target’s turns, it can make another Constitution saving throw. On a success, 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.