Dagoth_Rac wrote: »There are two kinds of armor reductions. Personal armor piercing, which leaves mob armor the same but lets you and you alone ignore some of it. Sharpened and the passives on Mauls/Maces are like this. And mob armor debuffs, which reduce mob armor and allow everyone to hit mob a little harder. Things like Major/Minor Fracture, Night Mothers Gaze, Alkosh, Crusher Enchant, Sunderflame set, etc., debuff enemy armor.
The formula is:
((Mob Base Armor - Mob Armor Debuffs) * (1 - percentage penetration)) - Flat Penetration
In your example:
((Mob Base Armor - Major Fracture debuff) * (1 - 0.20)) - Sharpened penetration