With your expertise in parry, you have a chance to stop any incoming melee weapon attack and are more likely to execute a riposte maneuver, giving you the opportunity to counter-attack.
On success you get 17 weapon parrying until canceled or ended.
Abilities are linked to certain classes and can be used by both players and non-player characters (NPCs). To use most abilities, you must first learn them and sometimes invest points into them. Occasionally, you may come across special ability scrolls with a limited number of uses. These scrolls allow you to use the ability even if you have not learned it, but you can only use the ability a certain number of times before the scroll is depleted.