Barbarians and Monks have an innate 30% passive damage reduction versus all sources. This damage reduction is applied at the same time as all other damage reducing effects (such as Armor), but prior to shield block.
Armor[edit | edit source]
Damage Reduction from Armor = Armor / (Armor + (50 * mLvl)) 
Resistances[edit | edit source]
Damage Reduction from Resistances = Resistance / (Resistance + (5 * mLvl))
Block[edit | edit source]
Absorb[edit | edit source]
Absorb is simply a limited amount of damage that can be prevented, usually invoked by skills such as Mantra of Healing.