Attacks are skills that directly damage enemies, usually using your equipped Martial Weapon. Spells are not Attacks. The base damage, attack speed and critical hit chance of an attack are determined using your Martial Weapon's stats unless the skill says otherwise. Attacks do not necessarily deal Physical damage — they can deal any damage type.

Skills which are Conditional require some sort of condition to be met before they can be used. Combo is an example of this, but almost anything can be a condition, such as having to have killed a certain number of enemies Recently or having to have moved a certain distance.

Critical Hits deal +100% extra damage (i.e. twice as much damage) by default. Critical Damage Bonuses can further modify this value. Attacks usually use your weapon's base Critical Hit Chance, while Spells and some other skills have their base Critical Hit Chance listed on the skill. Most modifiers to Critical Hit Chance are percentage based. For example, gaining 100% increased Critical Hit Chance on a base Critical Hit Chance of 7% would result in a final Critical Hit Chance of 14%.

Hits with this weapon roll against their Critical Hit chance twice when determining if they are a Critical Hit. If either roll succeeds, the hit will be a Critical Hit, and thus the Critical Damage Bonus will apply as normal. If both rolls succeed, the hit will be a Critical Hit, and the Critical Damage Bonus will apply twice to that Hit. If a modifier makes your Critical Hit Chance Lucky, that Luck will apply individually to both of these rolls.