slayer 'exploit weakness'
While some assassins contents themselves to ambush their prey, hoping to overcome them by sheer combat prowess, the slayer relies on careful study of his victims, exploiting any weakness they show to devastating effect. The exploit weakness skill increases the bonus damage dealt to a target vulnerable to an attack to +100% (normally +33%) for attacks that deal at least part piercing damage (e.g. daggers) to +100%, or to +80% for other damage types. In addition, it helps in pinpointing weaknesses using the estimate skill.