By its Nature
involves delving into places that are dark, dangerous, and full of mysteries to be explored. The rules in this section cover some of the most important ways in which adventurers interact with the Environment
in such places.
A fall from a great height is one of the most Common
hazards facing an adventurer. At the end of a fall, a creature takes 1d6 bludgeoning damage for every 10 feet it fell, to a maximum of 20d6. The creature lands prone, unless it avoids taking damage from the fall.
A creature can hold its breath for a number of minutes equal to 1 + its Constitution
modifier (minimum of 30 seconds).
When a creature runs out of breath or is choking, it can survive for a number of rounds equal to its Constitution
modifier (minimum of 1 round). At the start of its next turn, it drops to 0 Hit Points
and is dying, and it can’t regain Hit Points
or be stabilized until it can breathe again.
For example, a creature with a Constitution
of 14 can hold its breath for 3 minutes. If it starts suffocating, it has 2 rounds to reach air before it drops to 0 Hit Points
Vision and Light
The most fundamental tasks of adventuring— noticing danger, finding hidden Objects
, hitting an enemy in Combat
, and targeting a spell, to name just a few—rely heavily on a character’s ability to see.Darkness
and other effects that obscure vision can prove a significant hindrance.
A given area might be lightly or heavily obscured. In a lightly obscured
area, such as dim light, patchy fog, or moderate foliage, creatures have disadvantage on Wisdom
(Perception) checks that rely on sight.
A heavily obscured
area—such as Darkness
, opaque fog, or dense foliage—blocks vision entirely. A creature effectively suffers from the Blinded
condition (see Conditions
) when trying to see something in that area.
The presence or absence of light in an Environment
creates three categories of illumination: bright light, dim light, and Darkness
lets most creatures see normally. Even gloomy days provide bright light, as do torches, lanterns, fires, and other sources of illumination within a specific radius.Dim light
, also called shadows, creates a lightly obscured area. An area of dim light is usually a boundary between a source of bright light, such as a torch, and surrounding Darkness
. The soft light of twilight and dawn also counts as dim light. A particularly brilliant full moon might bathe the land in dim light.Darkness
creates a heavily obscured area. Characters face Darkness
outdoors at night (even most moonlit nights), within the confines of an unlit dungeon or a subterranean vault, or in an area of magical Darkness
A creature with Blindsight
can perceive its surroundings without relying on sight, within a specific radius. Creatures without eyes, such as oozes, and creatures with echolocation or heightened Senses
, such as bats and true Dragons
, have this sense.
Many creatures in fantasy gaming worlds, especially those that dwell underground, have Darkvision
. Within a specified range, a creature with Darkvision
can see in Darkness
as if the Darkness
were dim light, so areas of Darkness
are only lightly obscured as far as that creature is concerned. However, the creature can’t discern color in Darkness
, only shades of gray.
A creature with Truesight
can, out to a specific range, see in normal and magical Darkness
, see Invisible
creatures and Objects
, automatically detect visual illusions and succeed on Saving Throws
against them, and perceives the original form of a Shapechanger
or a creature that is transformed by magic. Furthermore, the creature can see into the Ethereal Plane.
Food and Water
Characters who don’t eat or drink suffer the effects of Exhaustion
caused by lack of food or water can’t be removed until the character eats and drinks the full required amount.
A character needs one pound of food per day and can make food last longer by subsisting on half Rations
. Eating half a pound of food in a day counts as half a day without food.
A character can go without food for a number of days equal to 3 + his or her Constitution
modifier (minimum 1). At the end of each day beyond that limit, a character automatically suffers one level of Exhaustion
A normal day of eating resets the count of days without food to zero.
A character needs one gallon of water per day, or two gallons per day if the weather is hot. A character who drinks only half that much water must succeed on a DC 15 Constitution
saving throw or suffer one level of Exhaustion
at the end of the day. A character with access to even less water automatically suffers one level of Exhaustion
at the end of the day.
If the character already has one or more levels of Exhaustion
, the character takes two levels in either case.
Interacting with Objects
A character’s interaction with Objects
in an Environment
is often simple to resolve in the game. The player tells the GM that his or her character is doing something, such as moving a lever, and the GM describes what, if anything, happens.
For example, a character might decide to pull a lever, which might, in turn, raise a portcullis, cause a room to flood with water, or open a secret door in a nearby wall. If the lever is rusted in position, though, a character might need to force it. In such a situation, the GM might call for a Strength
check to see whether the character can wrench the lever into place. The GM sets the DC for any such check based on the difficulty of the task.
Characters can also damage Objects
with their Weapons
are immune to poison and psychic damage, but otherwise they can be affected by physical and magical attacks much like creatures can. The GM determines an object’s Armor Class
and Hit Points
, and might decide that certain Objects
or immunity to certain kinds of attacks. (It’s hard to cut a rope with a club, for example.) Objects
always fail Strength
and Dexterity Saving Throws
, and they are immune to effects that require other saves. When an object drops to 0 Hit Points
, it breaks.
A character can also attempt a Strength
check to break an object. The GM sets the DC for any such check.