Chaos damage

Chaos damage is a damage type caused by Mesmer canes and staves, as well as the Elementalist's Ether Staff. Currently, the Assassin skill Seeping Wound is the only skill that deals Chaos damage. No monsters or armor seem to have any particular vulnerability or resistance to this type of damage.

Mesmer weapons are effective because there is no skill or armor that protects from or reduces Chaos damage.