Level
6th
Casting Time
1 Action
Range/Area
150 ft.
(60 ft. )
Components
V, S, M *
Duration
Instantaneous
School
Necromancy
Attack/Save
CON Save
Damage/Effect
Necrotic
A sphere of negative energy ripples out in a 60-foot-radius sphere from a point within range. Each creature in that area must make a Constitution saving throw. A target takes 8d6 necrotic damage on a failed save, or half as much damage on a successful one.
At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the damage increases by 2d6 for each slot level above 6th.
* - (the powder of a crushed black pearl worth at least 500 gp)
The AoE on this spell isn't big...it's god damned enormous. It's triple the size of a Fireball. There is no room in just about any dungeon that this spell wouldn't completely cover. It would have to be over 120ft wall-to-wall for this spell to not hit literally everything in the radius. Main problem with it hitting everything in the room is that it's almost certainly going to hit you and your allies as well unless the room so large that the back wall is further than 60ft away so you can simply target that.
Also, it doesn't consume its material component. You still can't substitute the component with a focus, but once you get that 500gp pearl powder, it's fair game for as many times as you want to use it.