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Resistances
Resistances represent a creature's capacity to withstand certain types of damage.
Overview
Vulnerability, resistance, and immunity are properties that modify how much damage a target takes from specific types of damage:
Bludgeoning
Piercing
Slashing
Cold
Fire
Lightning
Thunder
Acid
Poison
Radiant
Necrotic
Force
Psychic
These properties do not stack - their effect is the same even if multiple sources grant the property, whether for the same damage type or multiple ones that could apply. If a creature has both vulnerability and resistance against a source of damage, they effectively cancel each other out and the creature takes damage as if it had neither. Neither vulnerability or resistance affect immunity.
Features, spells and other game effects may grant these properties for a single damage type, several related types or even (rarely) all types of damage.
Vulnerability, resistance, and immunity can apply to non-magical sources of damage, magical sources of damage, or both. Generally, vulnerability and immunity apply to both, although exceptions exist. Magical sources of damage include spells, and weapons that are of uncommon rarity or above.
Vulnerability
Vulnerability means the total damage taken from a type of damage is doubled. When inspecting an entity, vulnerability is indicated by a downwards red arrow on the corresponding element. The game doesn't seem to include any creatures that have vulnerability only to non-magical or only to magical sources of damage.
Fire damage from All sources increased by 100%.
Resistance
Resistance means the total damage taken from a type of damage is halved. When inspecting an entity, resistance is indicated by an upwards blue and/or grey arrow on the corresponding element. Grey indicates that non-magical sources of damage are reduced, and blue indicates that magical sources of damage are reduced.
Fire damage from Non-Magical sources reduced by 50%.
Fire damage from Magical sources reduced by 50%.
Fire damage from Non-Magical and Magical sources reduced by 50%.
Immunity
Immunity means the total damage taken from a type of damage is reduced to 0. This means the creature takes no damage of that type, even if another effect applies vulnerability to the same type. When inspecting an entity, immunity is indicated by a yellow outline around the shield of the corresponding element. In some rare cases, the immunity may apply only to non-magical sources of damage, in which case the outline is grey instead of yellow.
Fire damage from Non-Magical sources reduced by 100%.
Fire damage from Magical and Non-Magical sources reduced by 100%.
Toughness
Toughness is a special property of some doors, chests, and breakable walls that requires a hit to exceed a certain damage threshold in order to deal any damage. The possible levels of Toughness are:
: Only a hit that deals at least 10 damage can damage this material.
: Only a hit that deals at least 22 damage can damage this material.
: Only a hit that deals at least 50 damage can damage this material.
All modifiers of the hit and vulnerabilities/resistances of the object are calculated first and then checked against the Toughness damage threshold.
There are several ways to beat the Toughness threshold of an object. Here are some common methods:
- Exploiting any specific damage Vulnerability of the material (typically
Fire for wood, 
Force for stone, and 
Acid for metal) - Attacking with a Maul using
to deal high 
Bludgeoning damage. - Using the
spell or another source of high 
Thunder damage. - Igniting
Smokepowder Barrel or other explosives.
