Armor-ignoring damage
From Guild Wars Wiki
Armor ignoring damage is a type of damage that ignores armor, dealing the same amount of damage regardless of armor level. In addition to skills which specify that they are armor ignoring, most skills which do not specify a damage type deal armor ignoring damage. Shadow damage and bonus damage from attack skills are always armor ignoring, as is holy damage inflicted directly by any skill other than Lightbringer's Gaze. Holy damage from attacks is never armor ignoring.
Armor ignoring damage also ignores character level, so a level 1 character using an armor ignoring skill will deal the same amount of damage as a level 20 character with the same attribute rank.
