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COMBAT MODIFIERS
Concealment
Concealment includes circumstances where nothing physically blocks an attack, but something interferes with the attacker's accuracy. Typically, concealment is provided by things like fog, smoke, shadows, darkness, foliage, and so forth.
Concealment Miss Chance
Concealment gives the subject of a successful attack a 20% chance (a roll of 17 or higher on d20) that the attacker missed because of the concealment. If the attack roll hits, the defender makes a miss chance roll to avoid being struck. Multiple concealment conditions do not stack.
Concealment and Stealth Checks
You can use concealment to make a Stealth check to avoid being seen. Without concealment, you usually need cover to make a Stealth check.
Total Concealment
A target you cannot perceive with any of your accurate senses has total concealment from you. You can't directly attack an opponent with total concealment, though you can attack into the area you think he occupies. A successful attack into an area occupied by a target with total concealment has a 50% miss chance (a d20 roll of 11 or higher).
Ignoring Concealment
Concealment isn't always effective. Characters with Night Vision can see clearly for a greater distance with the same light source than other characters, for example.
Table: Concealment
| Concealment | Example | Miss Chance |
|---|---|---|
| Partial | Fog; moderate darkness; foliage; precipitation | 17 or higher |
| Total | Total darkness; invisibility; attacker blind; dense fog | 11 or higher |

