The Stealth skill is an extra skill given to those players with a great ability in shadowy and covert movement. It decreases the chances that a player will get spotted by another player even if he or she is using a detection skill.That means that to even truly detect a player using Stealth, one must have another detection skill. For example, to detect someone at max Stealth level, you would need one max detection skill like Searching and another maxed detection skill like Detection. This skill therefore greatly enhances a user's stealth ability.
This skill becomes available only on floor 20 after the completion of a specific quest called "A Hunter's Lament." After this quest is completed, the player must have the Hiding skill or else no reward will be given except Col and a few drops. After acquiring the skill, it replaces Hiding.