Pathfinder Combat Rules: A Complete Reference

Pathfinder Second Edition's combat system is one of the most mechanically dense and deliberately designed frameworks in tabletop roleplaying — a system where a single action choice can cascade into an entirely different tactical situation. This reference covers the full architecture of PF2e combat: how encounters are structured, what drives outcomes, where the math gets contested, and where the rules get genuinely complicated. Whether the question involves multiple attack penalties or the precise difference between a Reaction and a free action, the answers live here.

• Definition and scope
• Core mechanics or structure
• Causal relationships or drivers
• Classification boundaries
• Tradeoffs and tensions
• Common misconceptions
• Checklist or steps
• Reference table or matrix

Definition and scope

Combat in Pathfinder Second Edition is the structured encounter mode that governs conflict between characters and adversaries — distinct from exploration and downtime modes, which handle travel, investigation, and rest. The rules codify exactly when time matters in one-second increments (called rounds), who acts when, and what the numerical consequences of each action are.

The scope is broad. "Combat rules" encompasses initiative, the three-action economy, attack rolls, damage rolls, defenses (Armor Class, saving throws), conditions, terrain, and special combat actions like Grapple, Shove, and Demoralize. It also touches the edge cases: mounted combat, cover mechanics, flanking, the rules for unconsciousness and dying, and how magical effects interact with physical ones.

Paizo, the publisher of Pathfinder, codified the Second Edition rules in the Core Rulebook (2019) and expanded them through Guns & Gears, The Grand Bazaar, and the ongoing Lost Omens line. The freely available digital compendium — Archives of Nethys — hosts the complete, officially licensed rules text at no cost, making PF2e one of the more accessible major RPG rulesets in terms of raw rules availability.

Core mechanics or structure

Every round of combat, each participant takes a turn in initiative order. On a turn, a character has 3 actions and 1 reaction to spend. This is the heartbeat of PF2e combat — a design decision that replaced the older standard/move/swift action taxonomy from First Edition and D&D 3.5.

Actions cost 1, 2, or 3 action symbols (written ◆, ◆◆, or ◆◆◆ in Paizo's notation). Reactions are triggered by specific events and can occur outside a character's turn. Free actions cost nothing but are still bound by trigger conditions.

The attack roll determines whether a Strike lands: roll 1d20, add the relevant attack modifier, compare against the target's Armor Class. The result lands in one of 4 degrees of success:

• Critical success (beats AC by 10+): deal double damage
• Success (meets or beats AC): deal normal damage
• Failure (misses AC): no damage
• Critical failure (misses AC by 10+): weapon-specific negative effect

This four-degree system applies to nearly every check in the game — not just attacks. Saving throws, skill checks, and spell effects all resolve on the same spectrum, which is one of PF2e's most significant departures from most competing systems.

The Multiple Attack Penalty (MAP) governs repeated strikes in a single turn: the second attack in a round takes a −5 penalty; the third takes −10. Agile weapons reduce these to −4 and −8. This penalty resets at the start of each new turn.

For a deeper look at how the action economy shapes every tactical decision, the Pathfinder action economy reference breaks down the three-action system in full.

Causal relationships or drivers

The four-degree success system creates a specific kind of math pressure. Because a natural 20 on the die counts as one degree better than the result would otherwise be (and a natural 1 counts as one degree worse), the d20 variance creates real swing. A fighter with a +15 attack bonus against an AC 20 enemy has a high baseline hit rate — but a monster with a +12 to its saving throw can still critically succeed a Reflex save against a spell that would otherwise devastate it.

Proficiency is the primary driver of combat effectiveness. PF2e uses a rank system — Untrained (no bonus), Trained (+2 + level), Expert (+4 + level), Master (+6 + level), Legendary (+8 + level) — where level scales alongside proficiency bonuses. This design, sometimes called "bounded accuracy" in competing systems but more aggressively scaled here, means that a 10th-level fighter is substantially more accurate than a 1st-level one — by design. The gap between a level-1 character and a level-20 one is intentionally large.

Conditions compound the math in both directions. The Frightened condition applies a penalty to all checks and DCs equal to its value (Frightened 2 = −2 to everything). Flat-Footed (also written as Off-Guard in the Remaster) grants attackers a +2 circumstance bonus. Flanking — positioning two allies on opposite sides of an enemy — is specifically defined as requiring opposite sides with 5 feet of movement access, and it automatically renders the target Off-Guard.

The conditions and effects reference details every condition in the game with full mechanical definitions.

Classification boundaries

PF2e separates combat actions into distinct types that interact with specific rules triggers:

• Strikes: the base attack action, targeting one creature or object
• Skill actions in combat: Grapple (Athletics), Disarm (Athletics), Feint (Deception), Demoralize (Intimidation), and others — these use skill DCs rather than AC
• Special combat actions: Raise a Shield, Step, Stride, Take Cover — single-action activities with defined mechanical effects
• Activities: multi-action sequences that function as a single unit (e.g., Casting a Spell ◆◆ is a 2-action activity, not two separate actions)

The attack trait is a critical classification boundary. Any action with the attack trait contributes to the MAP. Spells with the attack trait — like Electric Arc does not, but Ray of Frost does — trigger MAP and use the caster's spell attack modifier.

Bonus types matter for stacking. Circumstance bonuses, status bonuses, and item bonuses each stack with each other but not with themselves. Two sources of a +2 status bonus don't become +4 — only the highest applies. This is one of the most frequently looked-up rules in play.

Tradeoffs and tensions

The three-action economy creates genuine tactical tension because it equalizes action costs in ways that feel counterintuitive. Moving (Stride) costs the same as attacking (Strike) — one action each. A character who wants to move twice and attack once has spent all three actions. That trade-off forces meaningful decisions that faster, binary systems tend to compress.

The MAP creates a strong disincentive to triple-attack in most situations. The third attack at −10 (−8 with an agile weapon) is so penalized that alternative actions — tripping an enemy, raising a shield, positioning for a flank — frequently produce better expected outcomes. Players who treat the three-action system as a "hit three times" engine tend to underperform those who treat it as a resource allocation puzzle.

Bounded proficiency versus escalating level bonuses is a point of ongoing design debate among experienced PF2e players. The level-scaling math means that creatures fighting well above or below their level are either nearly untouchable or almost guaranteed to fail. The Game Mastery Guide (Paizo, 2020) addresses this directly with encounter-building guidelines, but the mechanical reality is that the "challenge rating" equivalent in PF2e is considerably less flexible than in some other systems.

Shield mechanics offer another interesting tension: using a shield requires spending an action to Raise a Shield (gaining the +2 AC bonus), and blocking damage requires spending the Reaction — which means a character who blocks a hit cannot also Attack of Opportunity on the same turn. Two resources, one turn, one Reaction.

The pathfinder-first-edition-vs-second-edition comparison covers how these design tensions represent deliberate departures from PF1e's design philosophy.

Common misconceptions

Flanking is automatic with two allies adjacent to an enemy. Not quite. The rules specify that the two flanking allies must be on "opposite sides or corners" of the target, and a line between them must pass through opposite sides or corners of the target's space (Core Rulebook, p. 476). Two allies standing at adjacent squares on the same side don't flank.

A natural 20 always hits. In PF2e, a natural 20 upgrades the result by one degree of success — but if the character's total still misses the AC, a natural 20 becomes a Success (normal hit), not a Critical Success. It only becomes a Critical Success if the total would already hit.

The dying condition kills you at Dying 4. A character at 0 HP gains the Dying 1 condition. Each failed recovery check increases Dying by 1. Death occurs at Dying 4. The conditions and effects reference covers the full dying-and-wounded track.

Spells don't provoke Attacks of Opportunity. Only specific classes have the Attack of Opportunity reaction (notably the Fighter), and it only triggers on specific actions — typically Strikes and some manipulate actions. Most classes don't have it at all, making the "I'll just cast a spell next to the enemy" risk assessment highly class-dependent.

Cantrips are weak fallback options. Cantrips in PF2e scale with the caster's level, dealing damage equivalent to a leveled spell slot of half their caster level, rounded up. A 10th-level caster's cantrips deal damage comparable to 5th-level spells. This is addressed in detail in the cantrips and focus spells reference.

Checklist or steps

Sequence of a standard attack turn:

1. Determine initiative position (already resolved before combat; Perception DC vs. +4 Stealth for ambushes affects flat-footed status)
2. Assess the battle map: identify adjacent enemies, reach weapons, cover status, and flanking geometry
3. Note current conditions: any ongoing penalties (Frightened, Clumsy, Enfeebled), status bonuses (Inspire Courage = +1 status to attacks and damage), and shield status
4. Allocate 3 actions — factor MAP: first attack at full modifier, second at −5 (or −4 agile), third at −10 (or −8 agile)
5. Resolve each attack: roll 1d20 + attack modifier vs. AC → determine degree of success
6. Apply damage: on a hit, roll weapon damage dice + ability modifier; on a critical hit, double the total damage (including static modifiers)
7. Apply persistent damage, conditions, and any end-of-turn effects
8. Declare Reaction availability for the next round (Attack of Opportunity, Shield Block, etc.)

Reference table or matrix

The Pathfinder Core Rulebook overview covers the full publication structure, and the skills and proficiency reference explains how the same proficiency framework that governs attacks extends to every skill check in the game — including the combat skill actions like Grapple and Demoralize that blend combat and exploration modes in practice.

For a comprehensive entry point to everything Pathfinder covers as a system, the Pathfinder Authority home page organizes the full reference library by topic area.

References

• Pathfinder Second Edition Core Rulebook — Paizo
• Archives of Nethys — Official Pathfinder Rules Compendium
• Pathfinder Game Mastery Guide — Paizo
• Pathfinder Remaster Project — Player Core (2023) — Paizo