Talk:Archangel's Staff/@comment-76.8.3.200-20120727103845/@comment-89.67.130.111-20120731233737

It's pretty bad on Karthus, get RoA instead, as it gives you health. Unless you plan to be a kamikaze, you should get a bit tanky so that they don't kill you by just looking at you.

If you don't get any defense, the enemy team won't have to think twice before killing you, because you'll die within a second, and after your passive is over, you'll still be dead. If you get a little bit tanky, then they will have to consider whether killing you before others is beneficial, and the extra few seconds will give you a huge advantage.