Vulnerability, Resistance, and Immunity (PSR Supplement)

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PSR is an alternate ruleset compatible with most 5e content.

System Differences

The Basics

Time
Shifts
Phases

The d20

Ability Check

Ability Scores

Strength
Dexterity
Constitution
Knowledge
Perception
Charisma

Saving Throws
Skills
Carry Slots

Encounters

Group Turns
Round‑Table Turns
Staggered Turns
Your Turn
Move
Action
Bonus Action
Reaction
Making an Attack
Unarmed Strike
Sunder
Defense
Cover

Hit Points & Damage

Temporary Hit Points
Damage Types
Max Damage

Other Dangers

Defeat
Dramatic Death
Common Hazards
Extreme Climates
Conditions

Downtime

Downtime Trading
Downtime Enterprise

Items

Goods & Currency
Material Goods
Weapons
Improvised
Attire
Shields
Tools
Gear
Attunement

Objects

Damaging Objects
Hauling Objects
Vehicles
Artillery

NPCs

Mount
Cohort
Stat Blocks
Vulnerability, Resistance, & Immunity
Special Senses

A creature sometimes has traits that render it more vulnerable or resilient against specific damage types, or specific conditions.

Immunity

If a creature has immunity to a damage type, it loses no hit points when it takes that damage. Any effect that would be inflicted alongside this damage, such as being Shoved, is not inflicted upon the this creature either.

If a creature has immunity to a condition, it can simply never have that condition. If a creature gains immunity to a condition it already has, it loses that condition immediately.

Vulnerability

If a creature has vulnerability to a damage type, any damage it takes from that type is maximized, as detailed in Max Damage.

If a creature has vulnerability to a condition, it has disadvantage on all saves it makes to avoid or end that condition on itself.

Resistance

If a creature has resistance to a damage type, it loses half as many hit points when it takes that damage.

Because damage resistance only affects hit points lost, and not the damage itself, it is applied after all other effects that modify damage.

If a creature has resistance to a condition, it has advantage on all saves it makes to avoid or end that condition on itself.

Condition resistance applies even if the save is made against multiple effects at once, with the condition being only one of those effects.

Resistance Doesn't Stack. If a creature somehow has resistance fire damage twice over, for example, it still only loses half as many hit points, not one-quarter as many.

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