GO BACK TO THE SHADOW
Spirits of darkness in your light take 2d8 damage (ignores armor). Roll damage for each spirit separately. A spirit reduced to 0 HP is either banished from this world or back to whatever tethers it here.
Reduced: affected spirits take only 1d8 damage.
Empowered: a spirit reduced to 0 HP is either utterly destroyed OR it's banished from the world and anything tethering it here is destroyed (GM's choice).