Interdict Boon: Last Word

Prerequisite: 13th Level Illrigger

When you are reduced to 0 hit points and have unplaced seals remaining, the hellfire in you refuses to die. You can expend up to 3 seals and release an explosion around you (no action required). Roll 3d6 per seal expended. Each creature of your choice within 30 feet of you must make a Dexterity saving throw. On a failed save, a creature takes fire damage equal to the total you rolled. On a successful save, a creature takes half as much damage. If this explosion damages at least one creature, you regain a number of hit points equal to the total you rolled.