Eruptive Radiance

An artifact often found in the Scar and other ruined sites that once operated under Mormo's command. They take the form of tiny white-golden pearls which cause radiant explosions when triggered by physical shock, which is why they should be stored in containers with lots of cushioning. It's assumed these pearls have been used to store energy and to fuel special machines with them.

Mechanics
You can use an action to throw one or multiple pearls up to 60 ft away. When they reach the end of its trajectory, they detonate in an explosion of radiant energy. Every creature in a 20 ft radius must make a DC 15 Dex Save. On a fail, the target takes 12d6 radiant damage, and half as much on a successful Save.