- 知覚［Free］
- Perception has a number of uses, the most common of which is an opposed check versus an opponent's Stealth check to notice the opponent and avoid being surprised. If you are successful, you notice the opponent and can react accordingly. If you fail, your opponent can take a variety of actions, including sneaking past you and attacking you.Perception is also used to notice fine details in the environment. The DC to notice such details varies depending upon distance, the environment, and how noticeable the detail is. The following table gives a number of guidelines.
| Detail | Perception DC |
|---|---|
| Hear the sound of battle | –10 |
| Notice the stench of rotting garbage | –10 |
| Detect the smell of smoke | 0 |
| Hear the details of a conversation | 0 |
| Notice a visible creature | 0 |
| Determine if food is spoiled | 5 |
| Hear the sound of a creature walking | 10 |
| Hear the details of a whispered conversation | 15 |
| Find the average concealed door | 15 |
| Hear the sound of a key being turned in a lock | 20 |
| Find the average secret door | 20 |
| Hear a bow being drawn | 25 |
| Sense a burrowing creature underneath you | 25 |
| Notice a pickpocket | Opposed by Thivery |
| Notice a creature using Stealth | Opposed by Stealth |
| Find a hidden trap | Varies by trap |
| Perception Modifiers | DC Modifier |
|---|---|
| Distance to the source object or creature | +1/10 feet |
| Through a closed door | +5 |
| Through a wall | +10/foot of thickness |
| Favorable conditions1 | –2 |
| Unfavorable conditions1 | +2 |
| Terrible conditions2 | +5 |
| Creature making the check is distracted | +5 |
| Creature making the check is asleep | +10 |
- 気配察知［Full-round］<習熟>
- 聞き耳を立てることで、近くの空間（例えば扉の向こう）に、どれくらいのクリーチャーがいるかを判断します。基本DCは20ですが、状況によって上下します（GM判断）。さらに、足音を忍ばせているクリーチャーがいる場合、そのクリーチャーのStealth達成値を超えなければ、数え間違います。広い空間で気配察知をした場合、30ft.以内の部屋の中にいるクリーチャーの位置をピンポイントで特定します。この場合でも、そのクリーチャーのStealth達成値を超える必要があります（このStealth達成値に、Invisibilityやそれに相当する効果に由来するボーナスは適用されません）。