| Level 11th | Casting Time 1 Action* | Range/Area 150ft. (1/2 mile radius sphere) | Components V, S, M* |
| Duration 8 Hours | School Evocation | Attack/Save Ranged | Damage/Effect Control |
You create a 2,640 ft. radius (1 mile diameter) sphere of poisonous, acidic fog centered on a point of your choosing, within range, that you can see. The fog spreads around corners. It lasts for the duration, or until the caster ends its effect with an action. The area is heavily obscured.
When a creature enters the spell's area for the first time on a turn or starts its turn there. That creature must make a Constitution saving throw. Creatures are affected even if they hold their breath or don't need to breathe. On a failure, a creature with less than 50 HP dies instantly.
* (The caster's life force) The cost of this spell, and its potency, alters based upon the price paid to cast it. With no bonus effect, just using your 11th-level Spell slot, the spell is cast with no material components. However, the caster can sacrifice their own life force to enhance the power of the spell. By sacrificing 25 hp, they can boost the spell to instantly kill anyone with less than 100 hp. By sacrificing 50 hp, they can boost the spell to instantly kill anyone with less than 150 hp. By sacrificing 100 hp, they can boost the spell to instantly kill anyone with less than 200 hp. If a caster reduces their own HP to 0 by casting this spell, their soul is severed from their body and cast into the Soul Cairn. Each tier of potency boost to this spell requires additional time, increasing the casting time by 1 turn per the level of boost, and reduces the caster's movement to 0 for the duration of the casting.