Vulnerability, Resistance, and Immunity (PSR Supplement)
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Common Hazards
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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.