In Dungeons & Dragons 5th Edition, concealment reduces the chance to hit a target by partially obscuring it, and understanding how it works is essential for both players and dungeon masters. This guide explains the core rules, the differences between half cover, three-quarters cover, and total cover, and how obscure conditions such as darkness, fog, and foliage interact with attack rolls and spell targeting. You will find practical examples, key distinctions from advantage and disadvantage, and guidance for adjudicating obscure effects in different environments.
What Is Concealment in D&D 5e
Concealment represents any obstacle that makes a target harder to see or aim at precisely, lowering the odds that an attack or spell effect that requires a hit will succeed. It does not grant total immunity, but it changes the mathematics of combat by effectively reducing the number of d20 outcomes that can hit. The rules describe it primarily in terms of two common forms of cover and by specific obscure conditions that grant either half or three-quarters concealment. It is separate from conditions such as blinded or invisible, though those can also affect hit chances.
Cover Versus Obscurement
Cover refers to physical barriers between the attacker and the target, such as walls, corners, furniture, or foliage. Obscurement refers to sensory uncertainty, such as being in darkness, in dim light without darkvision, or in a lightly obscured area like fog or moderate rain. The rules treat both as forms of concealment for the purpose of attack rolls, but they arise from different sources and can interact with other mechanics. Knowing when you have half cover, three-quarters cover, or total cover helps you decide where to position, how to cast spells, and when to rely on chance rather than precision.
Mechanical Effects of Cover
Half cover grants a +2 bonus to AC and Dexterity saving throws, while three-quarters cover grants a +5 bonus. Total cover means you cannot be targeted directly at all, though effects that do not require a target, such as a grenade’s splash or a burst spell’s area, can still reach you if you are within the area. These bonuses represent real barriers that make it harder to strike a target, and they are the most straightforward form of concealment in the game.
When determining whether a target has cover, the rule guidance asks whether any line from the attacker’s point of origin to the target intersects a solid barrier at any point before reaching the target. If it does, you usually have some level of cover depending on how much of the line is blocked. This method works consistently for ranged attacks, spell attacks, and effect areas, making it easy to apply at the table once the habit is formed.
Cover Table at a Glance
| Cover Level | Mechanical Effect | Typical Examples |
|---|---|---|
| Half Cover | +2 AC and Dexterity saves | Low wall, waist-high crate, large table, dense shrubbery |
| Three-Quarters Cover | +5 AC and Dexterity saves | Corner of a stone wall, narrow window slit, thick tree trunk |
| Total Cover | Cannot be directly targeted | Behind a full wall, inside a locked room with no line to target |
Obscurement Conditions That Grant Concealment
Conditions such as darkness and fog create obscure environments that impose a form of concealment even when there is no physical cover. In darkness, a creature without darkvision or other special senses is lightly obscured, which functions as half cover for attack rolls against that creature. In addition, heavily obscured areas, such as thick fog or a cloud of dust, create essentially total concealment for anything beyond close range, because the attacker cannot clearly see the target. These rules replicate the intuitive difficulty of hitting something you cannot see well.
Light, Darkness, and Visibility
Darkvision lets a creature see in darkness as if it were dim light, so they do not suffer the half-cover penalty from being in dim light or darkness from the attacker’s perspective. Creatures without darkvision have disadvantage on attack rolls against targets that are in darkness relative to them, representing the attacker’s impaired ability to see. This penalty is distinct from the half-cover effect of lightly obscured areas, but the two often overlap in environments such as torchlit dungeons or moonlit ruins.
- Dim light or darkness against a target with darkvision: no concealment for the attacker.
- Dim light or darkness against a target without darkvision: the target is lightly obscured, effectively having half cover against attacks.
- Heavily obscured areas, such as magical fog or thick smoke, typically impose three-quarters concealment against distant targets.
Cover and the Attack Roll Math
When concealment is present, the chance to hit changes in predictable ways. Against a target with half cover, the to-hit roll needs to beat AC as normal, but the effective challenge is closer to what you would expect against an AC two points lower. Three-quarters cover behaves like an effective AC five points lower, and total cover means a direct hit is impossible. Understanding these shifts helps you decide when to take a shot, when to move for better positioning, and when to rely on area effects instead.
Illustrative Examples
Imagine an archer on a tower trying to hit a figure crouched behind a low wall. The wall provides half cover, so the archer’s attack rolls suffer a +2 AC bonus. If thick smoke fills the courtyard, the same figure now has three-quarters cover from the attacker’s perspective, equivalent to a +5 AC bonus. If the figure steps fully behind a stone wall with no line of connection, total cover applies, and direct targeting is no longer legal. Spells and effects that do not require a specific target, such as a fireball or a cloud of daggers, can still affect targets in total cover if they fall within the area.
Tactical Considerations and Interaction with Advantage
Concealment is often discussed alongside advantage and disadvantage, but the mechanics differ. Advantage represents having a clearer line or better positioning, effectively letting you treat two rolls as the better one, while concealment makes it harder to hit by imposing a fixed bonus to AC. In some situations, multiple sources can interact; for example, you might have advantage while attacking a lightly obscured target, or disadvantage while attacking a target behind both cover and in dim light. Knowing when concealment, cover, and vision conditions stack helps you make better tactical choices and avoid common misinterpretations.
Guidance for the Dungeon Master
Adjudicating concealment consistently keeps combat fair and predictable. When in doubt, ask whether the attacker can clearly see and aim at a specific point on the target’s body from their position. If the barrier or obscuring effect blocks that line, apply the appropriate level of cover or obscurity. Use generous rulings in cinematic or heavily environmental scenes, and be transparent with players about why a given attack is harder or easier. Clear expectations about cover, obscure conditions, and line of effect reduce table friction and keep tactical decisions meaningful.
Common Questions and Edge Cases
Players and DMs often wonder how concealment interacts with forced movement, reach weapons, and spells that require specific targeting. A target that is pushed or pulled does not lose cover simply because they move, unless the movement eliminates or introduces cover. Reach weapons allow you to attack from a distance, but you still evaluate cover based on the line from your point of origin at the moment of the attack. Area spells that do not require a target can affect obscured creatures if the area overlaps them, but spells that require a specific attack roll usually apply concealment as normal. Clarifying these cases ahead of time prevents confusion and keeps the game moving smoothly.