Pathfinder Combat Rules: Core Mechanics Reference

Pathfinder Second Edition's combat system is built around a three-action economy that fundamentally changed how turns work when Paizo released the revised ruleset. This reference covers the full mechanical structure of combat in Pathfinder 2e — how encounters begin, how actions and checks resolve, how damage flows, and where the rules get genuinely contested. It draws from the Pathfinder Core Rulebook and supporting official sources.

• Definition and scope
• Core mechanics or structure
• Causal relationships or drivers
• Classification boundaries
• Tradeoffs and tensions
• Common misconceptions
• Combat sequence checklist
• Reference table: action types and costs

Definition and scope

Combat in Pathfinder 2e is a structured rules state called an encounter, one of three play modes described in the Core Rulebook alongside exploration and downtime. An encounter begins the moment the Game Master calls for initiative and ends when every creature on one side is defeated, has fled, or has surrendered — or when the narrative circumstances make further combat meaningless.

The scope of the combat rules is deliberately narrow in one sense and sprawling in another. The core combat loop — roll initiative, take a turn, apply damage or effects, repeat — fits on a single page. The full system, including conditions, the 20+ named actions available to every character, spell interactions, and the four-degree success system, runs across multiple chapters of the Core Rulebook and is expanded throughout the Pathfinder conditions and effects reference, the action economy guide, and the saving throws and checks reference.

The system covered here is specifically Pathfinder Second Edition. For differences from First Edition's iterative attack structure, the Pathfinder First Edition vs Second Edition page details the divergences.

Core mechanics or structure

Every creature in combat receives 3 actions and 1 reaction per round. This is the load-bearing pillar of Pathfinder 2e and the feature most distinct from its predecessor.

Actions fall into four cost categories:
- Single-action (◆): Strike, Step, Seek, Interact
- Two-action (◆◆): Cast a Spell (most spells), Sudden Charge, many class abilities
- Three-action (◆◆◆): Uncommon; some powerful abilities and rituals
- Free action (◇): No action cost, but typically limited to once per trigger
- Reaction (↺): Once per round, triggered by a specific condition (e.g., Attack of Opportunity)

The Strike action is the most-used single action. A creature makes an attack roll — 1d20 plus relevant modifiers — against a target's Armor Class. The four-degree success system (described in detail at the Core Rulebook overview) applies: critical success (roll exceeds AC by 10 or more, or a natural 20 meets AC) deals double damage; success deals normal damage; failure deals nothing; critical failure triggers a fumble effect if one is defined.

The Multiple Attack Penalty (MAP) applies −5 to the second attack in a round and −10 to the third (or −4/−8 with agile weapons). This is not optional and does not reset until the next turn.

Armor Class equals 10 + armor's item bonus + Dexterity modifier (capped by the armor's Dex cap) + proficiency bonus. Proficiency bonuses at level 1 are +3 for trained characters in Pathfinder 2e, scaling by level as part of the bounded accuracy alternative Paizo designed into the system.

Hit points work without wound thresholds below 0 — a creature reduced to 0 HP is knocked out (dying 1) rather than immediately dead. At 0 HP, the dying condition begins, and without aid the creature gains dying 1 each round on its turn; reaching dying 4 means death (Core Rulebook, Chapter 9).

Causal relationships or drivers

The three-action economy shapes almost every downstream decision in Pathfinder 2e combat. Because movement costs 1 action and attacking costs 1 action, players can move twice and attack once — or attack three times with increasing penalties. This creates a genuine tactical texture where a creature 30 feet away isn't automatically "safe," and a flanking position isn't free.

Flanking (positioning on opposite sides of a target) grants a +2 circumstance bonus to attack rolls. That +2 matters disproportionately because the four-degree system means a roll that misses by 1 is qualitatively different from a roll that hits — there's no partial damage for a near miss. A +2 bonus that converts even 1 in 10 misses into hits represents meaningful damage-per-round improvement.

The conditions system is the second major driver. Conditions like Frightened (−1 to −4 to all checks and DCs, reducing by 1 each round), Flat-footed (−2 AC), and Grabbed (immobilized and flat-footed) chain into one another. A caster who inflicts Frightened on a creature makes every subsequent attack roll against it more likely to succeed — the conditions compound.

Spell slot scarcity drives decision-making for casters differently than for martial characters. A 5th-level caster has at most 2 third-rank spell slots per day, per the Core Rulebook spell progression tables. That scarcity pushes casters toward cantrips and focus spells for routine encounters and reserves slot spells for high-stakes moments — a resource allocation problem that runs parallel to the action economy problem.

Classification boundaries

Pathfinder 2e formally divides damage types into physical (bludgeoning, piercing, slashing), energy (fire, cold, electricity, acid, sonic, positive, negative, force), and alignment (chaotic, evil, good, lawful — restricted by the rules to weapons and effects with specific traits). Many creatures carry immunities, resistances, and weaknesses expressed as flat numbers: a fire elemental might have resistance 10 to fire and weakness 5 to cold.

The combat system distinguishes between attacks and effects. Spells that require attack rolls (like ray of frost) are subject to MAP if used as part of a multi-attack turn; spells that require saving throws are not attacks and do not interact with MAP. This boundary matters enormously for action sequencing — a fighter who uses Grab and then casts a spell from a scroll takes no MAP penalty on that spell.

Strikes vs. other actions: Only actions with the Attack trait count toward the MAP. Trip, Disarm, and Grapple all carry the Attack trait and do trigger MAP. Seek, Recall Knowledge, and Raise Shield do not.

Tradeoffs and tensions

The three-action system creates a genuine tension between mobility and output. Moving twice and attacking once is almost always worse damage-per-round than attacking twice (even with −5 MAP), but positioning often determines whether flanking is available, whether the character is within range of a healing ally, or whether the creature can be caught by an area effect.

Reactive play vs. proactive spending: Every character gets 1 reaction, but most reactions require specific class feats to be useful. A fighter can spend a reaction on Attack of Opportunity; a rogue typically cannot. This creates a quiet inequality in defensive capability that compounds at higher levels, where reactions become the most powerful resource in the game for some classes.

Healing in combat is expensive: heal as a 1-action spell heals 1d8 per rank to a single target; as a 2-action spell it heals 1d8+8 per rank but targets one creature or damages undead in a burst. Spending 2 of 3 actions to heal an ally is a significant opportunity cost that many new players underestimate.

The broader Pathfinder RPG conceptual overview at /how-pathfinder-rpg-works-conceptual-overview addresses how this combat design fits into the game's philosophy — the system is deliberately designed to make "do nothing special" feel costly.

Common misconceptions

"The MAP applies to all actions." It does not. Only actions with the Attack trait trigger and are affected by MAP. Spell attacks are attacks and do count. Skill actions that target defenses (like Demoralize targeting Will) are not attacks.

"Critical hits only happen on a natural 20." A natural 20 upgrades a result by one degree — it turns a success into a critical success, not a failure into a hit. If the attack roll with a natural 20 still doesn't meet the target's AC, it's a success (a hit), not a critical hit. Conversely, any roll that exceeds AC by 10 or more is a critical success, regardless of whether the die showed a 20.

"Flat-footed means the creature loses its Dexterity bonus entirely." In Pathfinder 2e, flat-footed imposes a −2 circumstance penalty to AC. It does not interact with Dexterity caps or bonuses as a separate mechanism — the −2 is the full effect.

"A creature at 0 HP is dead." At 0 HP, a creature is dying, not dead. PCs at 0 HP fall unconscious at dying 1. Death occurs at dying 4, or immediately if damage in a single blow exceeds the creature's maximum HP (called a "massive damage" death, set at double max HP for PCs per the Core Rulebook).

Checklist or steps (non-advisory)

Standard combat turn sequence — Pathfinder 2e

Reference table or matrix

Core Pathfinder 2e Combat Action Costs and MAP Interaction

For the full Pathfinder feats guide covering feats that modify these actions — including feats that reduce MAP, grant extra reactions, or change action costs — that reference expands the above significantly.

The home reference for the broader game, including all three play modes, is the Pathfinder site index.