Armor
Armor improves Armor Class (AC) and provides Damage Resistance (DR). When taking damage, subtract the armor's DR from the damage dealt, preventing that much damage.
The quality and material of armor determine its AC, DR, and durability in notches.
Regardless of quality, all shields, helms, and armor can each absorb at least 1 notch. When suffering a wound, notch your armor to avoid it.
When armor is destroyed, it may continue to be worn—however, it only provides half the AC bonus and 0 DR. When helms or shields are destroyed, they are shattered and must be discarded.