Deadly Arts

The Deadly Arts attribute reflects an Assassin's skill when using hexes and magic. This is not a primary attribute and may be used by secondary assassins.

Guild Wars Description
No Inherent effect. Many assassins skills, especially those related to harming enemies, become more effective with higher Deadly Arts.

General Description
The Deadly Arts attribute increases the damage and duration of a variety of hexes on a enemy through deadly arts skills.

Associated skills
Deadly Arts mostly rely on hexes, making your target less effective. Like Curses for a Necromancer, Deadly Arts skills are more useful in PVP, where human players will find them very annoying.

That said, do you want to annoy the enemy or kill them? If you would rather be killing then I would advise that you use a second class like a Mesmer or Necromancer instead of Deadly Arts. But, however, if you want to get on the nerves of everyone< Deadly Arts is the thing for you.