Armor penetration

A higher armor level (AL) decreases the inflicted damage like Fast Casting decreases casting time.

Armor penetration with Armor Level:
Armor Penetration lenghtens the Half life of the inflicted damage per armor level and increases the required AL to let 100% of the inflicted damage trough.

With 0% Armor Penetation:

 * 60 AL lets 100% of the inflicted damage through.
 * 100 AL (60+40) lets 50% of the inflicted damage through.
 * 140 AL (60+40+40) lets 25% of the inflicted damage through.
 * The "AL half life" is +40 AL (known by most players).

With 10% Armor Penetraton:

 * 67 armor lets ~100% of the inflicted damage through.
 * 111 (67+44) armor lets ~50% of the inflicted damage through.
 * 155 (67+44+44) armor lets ~25% of the inflicted damage through.
 * The "AL half life" is ~ +44 AL.

With 20% Armor Penetraton:

 * 75 armor lets 100% of the inflicted damage through.
 * 125 (75+50) armor lets 50% of the inflicted damage through.
 * 175 (75+50+50) armor lets 25% of the inflicted damage through.
 * The "AL half life" is +50 AL.

With 25% Armor Penetration:

 * 80 armor lets 100% of the inflicted damage through.
 * 133 (75+53) armor lets ~50% of the inflicted damage thhrough.
 * 186 (75+53+53) armor lets ~25% of the inflicted damage through.
 * The "AL half life" is ~ +53 AL.

This especially hurts players with a high AL.

The formular for weapon damage is:

 * If attribute skill <=12:
 * actual_damage = Damage*(Damage_bonus/100+1)*2 ^ ((5*(Attribute_skill -AL*(1-Armor_penetration/100)) -(60)) /40)
 * If Attribute Skill >12:
 * actual_damage = Damage*(Damage_bonus/100+1)*2 ^ ((5*(Attribute_skill -AL*(1-Armor_penetration/100)) -(60+(AttributeSkill-12)*2,5)) /50)

and for skill damage:
 * actual_damage = Damage * 2 ^ ((caster_level * 3 * AL * (1 - penetration))/ 40)