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Unofficial rules compendium
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Perception Check Modifiers
These Perception check modifiers typically apply to perceive someone using Stealth, but can also apply in other situations.
Circumstance |
Perception modifier
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Distance |
-1 per 10 feet
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Listening with ear against a conducting surface (door, floor) |
+2
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Against an event behind an obstacle (corner, closed door) |
-5
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Against improved cover |
-10
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Against total concealment (invisible, full cover) |
-20
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Observer is distracted (busy, in melee) |
-5
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Observer is asleep |
-10
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The -20 modifier for total concealment assumes a situation with a fair amount of distractions, like a city street or busy room. In a quiet setting or when another sense could reveal the character this modifier is reduced to -10, or even less in an absolute quiet.
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