Cloudkill

Cloudkill

5th-rank - Wizard Spell: Conjuration

Casting Time: 1 action

Range: 120 feet

Duration: Concentration, up to 10 minutes

Components: V, S

Materials:

Auditory Sensory Effects: None

Visual Sensory Effects: Gargantuan

Olfactory Sensory Effects: Very Strong

Casting Perception Mod +2

Effect Perception Mod +12

Pulsing red aura coalesces into a 20-foot-radius sphere of poisonous, yellow-green fog centered on a point you choose within range. The fog smells with the stench of death and spreads around corners. It lasts for the duration or until strong wind disperses the fog, ending the spell. Its 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. The creature takes 5d8 Poison Damage on a failed save, or half as much damage on a successful one. Creatures are affected even if they hold their breath or don't need to breathe.
The fog moves 10 feet away from you at the start of each of your turns, silently rolling along the surface of the ground. The vapors, being heavier than air, sink to the lowest level of the land, even pouring down openings.

At higher ranks: When you cast this spell as a spell of 6th rank or higher, the damage increases by 1d8 for each rank above 5th.