The official RAW for the 1st level spell Fog Cloud reads: “You create a 20-foot-radius sphere of fog centered on a point within range. So yeah, everyone in that sphere of fog is basically Blinded, unless they have Blindsight (such as bats, oozes, and true dragons) — and no, having Darkvision doesn’t help you, here.
Can Darkvision see through smoke?
No, darkvision doesn’t let you see through a heavily obscured area.
Can Darkvision see in pitch black?
Yes, darkvision allows a creature or character to see in complete darkness. Yes, darkvision explicitly states that creatures with it can see in pitch blackness, although it is worth noting that a magical Darkness renders even darkvision useless.
What happens when fog cloud blocks your vision?
A heavily obscured area–such as darkness, opaque fog, or dense foliage–blocks vision entirely. A creature effectively suffers from the blinded condition (see appendix PH-A) when trying to see something in that area. Next, we have the errata: Vision and Light (p. 183).
When does the radius of the fog increase?
At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the radius of the fog increases by 20 feet for each slot level above 1st.
Can a creature see outside of a fog cloud?
You are correct in interpreting the rules as saying a creature within a fog cloud can clearly see outside of the fog cloud because the spell states it creates an area of heavy obscurement and the rules for heavy obscurement specify that you are only penalized when attempting to see something in the area of heavy obscurement.
How big does the fog cloud spell get?
The fog cloud spell says (emphasis mine): 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. […]
