**Armor** is a unit stat that reduces incoming physical damage.

*Final Damage*=*Base Damage*× 0.97^{Armor}

In other words, the first point of armor reduces damage by 3%, the second point reduces that damage by 3%, the third reduces that damage by 3%, and so on. For example, 10 points of armor multiplies physical damage by (0.97^{10} =) 73.74%, which corresponds to a physical resistance of (1 − 0.97^{10} =) 26.26%.

*Physical Resistance*= 1 − 0.97^{Armor}

Armor is one source of physical resistance. This stacks multiplicatively with physical resistances from items, abilities, or other effects. For any given resistance, its damage multiplier is equal to 100% minus the resistance value. For example, 20% physical resistance corresponds to an 80% damage multiplier. When you have multiple resistances, multiply their damage multipliers together to determine the total damage multiplier; you can then subtract that from 100% to determine your total physical resistance. For example, two 20% resistances result in 80% times 80%, or 64% damage multiplier, so the total resistance would be 36%.