From Guild Wars Wiki
Chaos damage is a damage type that is neither physical nor elemental. Lorewise, it is associated with Lyssa which in game terms means it is inflicted by Mesmers and non-randomly generated Energy Storage weapons.
- Chaos damage is not armor-ignoring; it is non-physical, non-elemental damage which uses the normal damage calculations.
Skills that make a weapon inflict chaos damage
|Elite Form. (10...74...90 seconds.) Your Dervish enchantments recharge 50% faster and deal chaos damage with attacks. Steal 1 Energy from nearby foes when you lose a Dervish enchantment. This skill is disabled for 45 seconds.||5||2||20||MysticismZ||Nightfall|
- According to the developers, nothing in the game currently checks for chaos damage, making chaos damage functionally identical to dark damage and typeless damage.
|Elemental damage||Cold damage • Earth damage • Fire damage • Lightning damage|
|Physical damage||Blunt damage • Piercing damage • Slashing damage|
|Miscellaneous||Chaos damage • Dark damage • Holy damage • Shadow damage|