As from I know, Fog Cloud creates a heavily obscured environment on its location, rendering every creature in it a blinded status. I would treat it like how it is on Darkness spell but some players said there is a catch on how to deal with seeing though a Fog Cloud. They said that a creature from outside of the Fog Cloud can't see what is inside the area but a creature in the Fog Cloud can see what is outside of the spell radius (I saw a post in the DnD reddit forums. I'll see to edit here as soon as I find it). How true is this situation and is there any ruling for that?
From the definition of heavily obscured area (which is reported below), it seems that creatures both inside and outside the fog cloud are effectively blinded when trying to make an attack against another creature inside the fog.
A heavily obscured area—such as darkness, opaque fog, or dense foliage—blocks vision entirely. A creature effectively suffers from the blindedcondition when trying to see something in that area.
You create a 20-foot-radius sphere of fog centered on a point within range. The sphere spreads around corners, and its area is heavily obscured. It lasts for the duration or until a wind of moderate or greater speed (at least 10 miles per hour) disperses it.
A heavily obscured area--such as darkness, opaque fog, or dense foliage--blocks vision entirely. A creature effectively suffers from the blinded condition when trying to see something in that area.
A blinded creature can't see and automatically fails any ability check that requires sight.
Attack rolls against the creature have advantage, and the creature's attack rolls have disadvantage.
So anyone in the area are blind and anyone trying to see into the area are treated as blind when seeing into it.
Think of it ths way: if you're in a burning building and the room fills completely with smoke thick enough to stop people being able to see into the room - do you still have the ablity to see out of it? Nope. All the spell does is basically release a smoke bomb.
Fog Cloud and Darkness both work the same way but Fog Cloud is easier to get rid of while Darkness has more versatility in use but this is why Darkness is a higher level spell.
Your players are arguing that fog is somehow transparent when light travels through it in one direction, but opaque when light attempts to travel through it in another direction.
This is not how any fog I've ever experienced works, and the spell doesn't say anything about the fog being created being magical, or having any special optical properties.
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As from I know, Fog Cloud creates a heavily obscured environment on its location, rendering every creature in it a blinded status. I would treat it like how it is on Darkness spell but some players said there is a catch on how to deal with seeing though a Fog Cloud. They said that a creature from outside of the Fog Cloud can't see what is inside the area but a creature in the Fog Cloud can see what is outside of the spell radius (I saw a post in the DnD reddit forums. I'll see to edit here as soon as I find it). How true is this situation and is there any ruling for that?
From the definition of heavily obscured area (which is reported below), it seems that creatures both inside and outside the fog cloud are effectively blinded when trying to make an attack against another creature inside the fog.
Anyone in a Fog Cloud is effectively blinded and cannot see. This means they cannot see anything - be it in the cloud or outside of it.
From the Fog Cloud:
From the rules of heavily obscured areas in 'The Environment - Vision and Light':
From the Blinded condition:
So anyone in the area are blind and anyone trying to see into the area are treated as blind when seeing into it.
Think of it ths way: if you're in a burning building and the room fills completely with smoke thick enough to stop people being able to see into the room - do you still have the ablity to see out of it? Nope. All the spell does is basically release a smoke bomb.
Fog Cloud and Darkness both work the same way but Fog Cloud is easier to get rid of while Darkness has more versatility in use but this is why Darkness is a higher level spell.
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Common sense should prevail here.
Your players are arguing that fog is somehow transparent when light travels through it in one direction, but opaque when light attempts to travel through it in another direction.
This is not how any fog I've ever experienced works, and the spell doesn't say anything about the fog being created being magical, or having any special optical properties.
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Not to mention creating an impenetrable one-way mist with no saving throws or caveats is well beyond the reasonable abilities of a 1st-level spell.
Even a blind squirrel finds a nut once in awhile.