Resistance
Basics
Resistance refers to an object's (living or inanimate) ability to withstand damage. Objects with little resistance will suffer the brunt of the damage, while those with high resistance may potentially escape unscathed. Objects designed for protection (armour, spells) confer their resistance, both positive and negative, upon their user. Each form of resistance is only effective against its associated form of damage. As attacks may deal multiple types of damage, it's possible for an object with high resistance to a specific form of damage to ward off one aspect of the attack yet suffer other forms of damage.