The answer to both questions is no. Here’s some elaboration on that answer. Some spells and other game features create an area of effect that does something when a creature enters that area for the first time on a turn or when a creature starts its turn in that area.
Can spells go through prismatic wall?
The indigo layer of prismatic wall prevents you from casting spells through it. This doesn’t stop a spell with a range of self, such as misty step, but it does stop dimension door, which has a range of 500 ft.
Where does the wind wall spell end Cloudkill?
The Wind Wall spell only creates strong winds within its AoE: outside of that ‘normal’ winds apply. Since Cloudkill depends on these ‘normal’ winds not being ‘strong’, the Cloudkill effect is ended where it overlaps the Wind Wall. I would be forgiving and allow the wind wall spell to dissipate the cloudkill.
How long does it take for Cloudkill to do damage?
(The average of 5d8 is 23, the average of 8d6 is 28.) So, in order for cloudkill to out-damage a spell two levels lower than it, it needs to deal damage on at least two turns. This isn’t easy on most battlefields. The cloud’s radius is only 20 feet, so a creature with 30 feet of movement always has at least one way of escaping the cloud’s area.
What’s the weakness of the 2nd level Cloudkill spell?
It also has the troubling weakness of being able to be dispersed by strong wind, such as those created by the 2nd-level spell gust of wind. All this to say, while cloudkill may look like another area-of-effect damage spell, its actual applications are much subtler.
How does Cloudkill work in D & D beyond?
Since cloudkill deals damage when a creature starts its turn in the cloud and the first time on a turn that it enters the cloud’s radius, your allies can use abilities that force enemies to move to hurl them into the cloud. Such effects include command, fear, thunderous smite]
