Pathfinder Concealment and Invisibility Rules
Pathfinder's concealment and invisibility rules govern one of the most contested areas of tactical combat: what a creature can and cannot see, and what happens when it can't. These rules split into two distinct but overlapping systems — concealment, which imposes miss chances, and invisibility, which removes a target from sight entirely. Getting them wrong at the table produces arguments; getting them right produces interesting tactical decisions.
Definition and scope
Concealment applies whenever something — darkness, fog, a blur effect, a displacement spell — interferes with a creature's line of sight without eliminating it completely. The core mechanic is a miss chance: a flat percentage rolled before an attack roll counts. The standard concealment miss chance is 50%, and total concealment (where a creature is present but still detectable in some way) also carries a 50% miss chance (Pathfinder Reference Document, Paizo).
Invisibility is a condition, not just a degree of concealment. An invisible creature has total concealment against sighted creatures, but the rules layer several additional effects on top: attackers cannot even pinpoint an invisible creature unless they detect it through other means. The Pathfinder Core Rulebook distinguishes between a target being "located" (the attacker knows roughly where they are) and a target being "pinpointed" (the attacker knows their precise square).
How it works
The miss chance mechanic works as follows:
- Attack is declared against a target with concealment.
- Miss chance roll: the attacker rolls d% (1d100). If the result falls within the miss chance percentage — 20% for partial concealment from light brush or a minor smoke effect, 50% for total concealment — the attack automatically misses regardless of the attack roll.
- Attack roll proceeds only if the miss chance roll succeeds (the attack is not automatically negated).
- Damage and effects resolve normally if the attack roll hits.
The 20% miss chance applies to partial concealment situations such as dim illumination in Pathfinder (specifically, creatures in areas of dim light have concealment against creatures without low-light vision or darkvision). Blur and displacement spells function differently: blur grants 20% miss chance, while displacement grants 50% — not because the target is invisible, but because the perceived position is wrong.
For invisibility specifically, an attacker who does not know the invisible creature's square must guess. A guess at the wrong 5-foot square has a 50% miss chance automatically, plus whatever the actual miss chance is. Successful perception checks — or spells like see invisibility — allow a creature to be pinpointed, which removes the guessing penalty but not the 50% miss chance itself.
Common scenarios
Invisible attacker vs. unaware defender: The invisible attacker gains a +2 bonus to attack rolls and the defender is denied their Dexterity bonus to AC. This stacks with the flank-equivalent advantage of striking from an unexpected position, making invisibility one of the highest-leverage combat conditions in the game.
Smoke or fog conditions: A fog cloud spell or mundane smoke creates partial or total concealment depending on density. Creatures within a fog cloud typically have total concealment against creatures more than 5 feet away, producing a 50% miss chance on all ranged and melee attacks that cross that boundary.
Underwater combat: Underwater, creatures without the aquatic subtype treat all opponents as having concealment beyond 5 feet, stacking with any magical concealment already in play.
Blindsight and tremorsense: Creatures with blindsight (range typically 30–60 feet depending on stat block) negate concealment and invisibility entirely within that range. Tremorsense, however, only detects creatures in contact with the ground — a flying invisible target floats outside its reach.
Decision boundaries
The critical distinction the rules draw is between concealment (miss chance, target still visible in some form) and invisibility (total concealment plus the pinpointing problem). A character who fails a Perception check against a hiding creature treats that creature as having total concealment — but not as invisible. The practical difference: they know roughly where to swing, even if they can't see precisely.
The Pathfinder key dimensions and scopes page covers how conditions interact with combat resolution more broadly, which matters when multiple miss chances stack — or fail to stack. Displacement and blur do not stack with each other; only the highest miss chance applies. Invisibility's 50% miss chance, however, is a separate source and does not redundantly layer with displacement.
A common ruling debate: does see invisibility negate the miss chance? Per the Pathfinder Core Rulebook, it allows the viewer to see the invisible creature as if it were visible — meaning the 50% miss chance is removed entirely, not just the guessing problem. That's a significant mechanical payoff for a 2nd-level spell slot.
For deeper mechanical context on how these rules fit within Pathfinder's broader framework, the Pathfinder rules overview lays out the system's foundational structure, including how condition-based modifiers interact with base combat resolution.