Stealth (Dexterity)

Armor Check Penalty
Make a Stealth check to conceal yourself from enemies, slink past guards, slip away without being noticed, and sneak up on people without being seen or heard. This skill is used against another creature’s Perception check or against a DC set by the DM.

Stealth: At the end of a move action when you are trying to perform stealthily.

✦ Opposed Check: Stealth vs. passive Perception for every enemy present. If you move more than 2 squares during the move action, you take a -5 penalty to the check. If you run, a -10 penalty.
✦ Becoming Hidden: You can make a Stealth check against an enemy only if you have superior cover or total concealment against it or if you are outside the enemy’s line of sight. Outside combat, the DM can allow you to make a Stealth check against a distracted enemy, even if you don’t have superior cover or total concealment and aren’t outside the enemy’s line of sight.
✦ Remaining Hidden: You remain hidden as long as:
  Keep Out of Sight: If you no longer have cover or concealment against an enemy, you don’t remain hidden from it. You can’t use a creature as cover.
  Keep Quiet: If you speak louder than a whisper or otherwise draw attention to yourself, you don’t remain hidden from an enemy that can hear you.
  Keep Still: If you move more than 2 squares, you must make another check with the move penalties.
  Don’t Attack: If you attack, you don’t remain hidden.
✦ Not Remaining Hidden: If you take an action that causes you not to remain hidden, you retain the benefits of being hidden until you resolve the action. You can’t become hidden again as part of that same action.
  Enemy Activity: An enemy can try to find you on its turn. If it makes an active Perception check and beats your Stealth check result, you don’t remain hidden. Also, if he enters your space, you are not hidden.
✦ Success: You are hidden, which means that you are silent and invisible to the enemy.
✦ Failure: You can try again at the end of another move action.
✦ Combat Advantage: You have combat advantage against a target you are hidden from.
✦ Light Source: Observers automatically see you if you’re carrying a light source.