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One of the PC who plays in my Encounters session has a power that lets him make a stealth check to hide if he has "concealment." Last night we was behind a hard corner in a room without any other terrain effects. The monsters had their line of sight partially blocked which gave him cover. So the question came up on whether cover also grants concealment for the purpose of making a stealth check with his power. This was important to the PC because if he makes a successful Stealth check he gets combat advantage and does more damage.

I ruled that it did not because even though the monsters would have a difficult time hitting his PC with a ranged attack due to the cover, they could still partially see the square he was standing in as he was trying to hide.

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The PC has the Hidden Sniper feat. Benefit: If you have partial concealment against a target, you gain combat advantage against it with your ranged attacks. I'm trying to remember what is requiring the stealth check. –  ChrisP Apr 30 '11 at 3:22
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No, cover and concealment do not normally influence each other.

Cover and concealment are different properties.

Cover is derived from interrupted lines of effect:

The target is around a corner or protected by terrain. For example, the target might be in the same square as a small tree, obscured by a small pillar or a large piece of furniture, or behind a low wall.

Concealment is derived from obscured terrain:

Lightly Obscured: Squares of dim light, foliage, fog, smoke, heavy falling snow, or rain are lightly obscured.

Heavily Obscured: Squares of heavy foliage, heavy fog, or heavy smoke are heavily obscured.

A creature has total concealment when it is in a totally obscured square. Example: Total darkness.

Therefore, hiding directly behind a corner may be sufficient to give a character cover, but there's nothing preventing monsters from perceiving that character in that square. However, if it's in a darkened corner, there may exist low-light in the square as well as physical obstruction. Both interrupting line of effect and having some condition that worsens visibility.

Most stealth checks require:

A creature can make a Stealth check against a target only if the creature has superior cover or total concealment against that target or if the creature is outside the target’s line of sight.

Which a darkened corner would not normally grant, save for special cases like the Shade race.

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A creature can make a stealth check against a target only if the creature has Superior Cover or Total Concealment against that target or if the creature is outside the target's line of sight.[Rules Compendium, pg152]

Now the difference between cover and superior cover:

Cover

The target is around a corner or is protected by terrain. [Rules Compendium, pg219]

Superior Cover

The target is protected by significant terrain advantage. [Rules Compendium, pg219]

If he's in that same corner throughout the entire game then he would get sneak attack once, unless he's moving about. You can only roll a stealth as part of a move action. And after attacking you are no longer hidden.

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My understanding is that you can burn your move action on a turn to make another stealth check without actually moving. Therefore if they want to stay in one place they can make another stealth check, but their move action is then gone. –  wax eagle May 2 '11 at 13:12
    
You make a stealth as 'part of a move action'. You have to move unless something grants you a stealth check. Please show me, anywhere in the history of D&D, where you can make a stealth check without moving (without a feat, item, etc) –  Caden Raikoujin Iyori May 4 '11 at 21:13
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Can't find a compendium reference. However its quite clear in the "Rules of the Hidden Club" page on the WOTC forum "Q:Can I "move 0" and become Hidden? A: Yes, if you used a Move Action. Same with standing up - any Move Action, or any action that lets you Move." –  wax eagle May 5 '11 at 17:12
    
As I read this 'Rules of the Hidden Club'... you still have to MOVE. 'Move 0' refers to falling prone then standing up, which are move actions where you do not move outside of the square. You can NEVER substitute a move action to make a stealth normally. '...any move action, or any action that lets you move.' –  Caden Raikoujin Iyori May 8 '11 at 6:58
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It may help to also reference the 4.0 Shade race. It has a utility called One With Shadow that specifically mentions these abilities.

One With Shadow - until the end of your next turn, you can make Stealth checks to become hidden when you have cover or concealment. In addition, you can use cover from your allies to become hidden or to remain hidden.

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I'm not clear how this answers the posters question. –  Simon Withers Feb 24 '13 at 21:54
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