When a damaging attack hits a target, the attack's Penetration is compared to the target's Armor Rating to determine how much damage gets through.
Penetration comes from the weapon or spell that is being used, but can be raised through the use of magic, Abilities, Talents, or weapon enchantments. Penetration is compared to the Armor Rating of the attack's damage type. E.g. A Fireball will always check Penetration against Burn Armor Rating. Raw Damage bypasses all armor and does not need to penetrate.
Armor Rating is compared against the Penetration of oncoming attacks to determine the attack's overall effectiveness.
- Full Penetration (130% Damage) occurs when Penetration is twice the target's Armor Rating or more.
- Partial Penetration (100% Damage) occurs when Penetration meets or exceeds the target's Armor Rating.
- Under Penetration (-25% Damage for each point under the target's Armor, Max -75%) occurs when Penetration is less than the target's Armor Rating.