「
知覚されにくい」 is a flexible advantage that can represent many fictional abilities -- some of which are unobvious by design. When customizing 「
知覚されにくい」, the first step is to specify what senses it affects, and how:
「
超感覚」: 「
知覚されにくい」 usually blocks one sense, whether the observer examines the affected area in person or remotely. A supernatural or superscience “anti-power” might specifically prevent all remote sensing without affecting any mundane senses.
「
知覚されにくい」 (「
超感覚」) often has Extended for 「
探知」, Divination, or 「
超レーダー」 (+20% each) and Limited, Psi (-20%).
Detect: An effect that actively jams a specialized sensor should have 「
知覚されにくい」 against the equivalent 「
探知」.
For instance, 「
知覚されにくい」 (
探知 Magnetic Fields) would work against magnetic anomaly detectors. Other forms of 「
知覚されにくい」 might affect supernatural versions of
探知 --imagine a demon with 「
知覚されにくい」 (
探知 Evil)!
Divination: 「
知覚されにくい」 (Divination) is legitimate, and affects all attempts to gather facts from within the area through such means as Information spells and 「
サイコメトリー」. Use 「
知覚されにくい」 (「
超感覚」) to disrupt remote viewing.
Hearing: This might represent a magical stealth spell, white noise, or ultra-tech sound cancellation. Regular hearing, Subsonic Hearing, Ultrasonic Hearing, Sonar, and 「
振動感覚」 are all “related” for the purpose of the Extended enhancement.
「
知覚されにくい」 (Subsonic Hearing) and (Ultrahearing) suffice to evade geophones and ultrasonic motion detectors, respectively. Discriminatory Hearing, Parabolic Hearing, and so on aren’t unique senses; they merely make hearing more useful. Those who have such traits have no special ability to ignore 「
知覚されにくい」.
「
走査感覚」: Treat Radar and 「[イメージング・レーダー]]」 as the same sense for the purpose of 「
知覚されにくい」. Other 「
走査感覚」s require separate versions of 「
知覚されにくい」. These varieties of 「
知覚されにくい」 nearly always represent jamming of some kind. For the purpose of the Extended enhancement, Ladar is related to all kinds of vision, while Sonar is related to 「
振動感覚」 and all types of hearing. In most settings, 「
超レーダー」 is related to 「
超感覚」 and 「
探知」.
Vision: This could be darkness, blinding light, fog, smoke, or a magical blurring spell. Regular vision, 「
赤外線視覚」, 「
紫外線視覚」, and Ladar are all “related” for the purpose of the Extended enhancement. 「
知覚されにくい」 (「
赤外線視覚」) also interferes with heatseeking missiles and infrared motion detectors. Microscopic and 「
望遠視覚」, 「
広視界」, etc. aren’t unique senses; they just make vision more useful. Those with such
有利な特徴 have no special ability to ignore 「
知覚されにくい」.
Penalties for 「
知覚されにくい」 also apply to any form of 「
遠隔通信」 (p. 81) that uses the same type of signal as the blocked senses, if the sender or receiver is inside the area of effect.
「
赤外線通信」 works like 「
赤外線視覚」, 「
レーザー通信」 works like Ladar, 「
電波」 works like Radar, and so on. It’s up to the GM whether 「[転送]]」 works like 「
超レーダー」.
By default, 「
知覚されにくい」 is a detectable jamming field (e.g., darkness, electronic noise, or white noise) or cloud (anti-laser aerosol, radar-defeating chaff, smoke, etc.) around the user.
Without special modifiers, it impedes signals crossing it in either direction.
There are two common exceptions to these assumptions:
忍び Field: A subtle effect that prevents detection of the user and the field itself is standard for magic and psionics, and common for superscience cloaking. This requires
忍びy (+100%). Supernatural versions rarely inconvenience the user, and also have Defensive (+50%). Ultratech devices generally block the user’s sensors, too.
Weapon: Many supers and vehicles shoot beams or projectiles that cause these effects at a distance; e.g., flares for 「
知覚されにくい」 (「
赤外線視覚」) or smoke bombs for 「
知覚されにくい」 (Vision).
Give such abilities 「
離れた地点に効果」 (+50%).
Don’t add
忍びy to anything that’s supposed to work as a decoy or distraction.
■代替案(Alternatives)
「
知覚されにくい」 creates an effect within which anyone could hide. A hero who makes only himself less detectable has Cameleon (p. 43), 「
透明」 (p. 56), or 「
音を立てない」 (p. 76).
An 「
特殊効果」 (p. 39) with an enhancement such as Disadvantage (Deafness) or Negated Advantage (「
赤外線視覚」) can knock out someone else’s senses. Combined with 「
範囲に効果」, 「
放射」, and 「
感覚に依存」, this simulates a deafening noise, blinding flash, etc. better than
「
知覚されにくい」.
Those who can block senses with images --physical or mental --should take 「
幻影」 (p. 94).
■追加特別限定(New Special Limitation)
Limited: You can only block a sense that occurs as part of a power. An entire power source (e.g., magical or psionic) is -20%; a specific power (e.g., ESP or Telepathy) is -40%.
■パワーアップ(Powering Up)
「
知覚されにくい」 suits nearly any power that isn’t completely internal. Most elemental powers can create clouds or fields of their element to block senses (e.g., Heat/Fire power might produce “hot smoke” to impede vision and 「
赤外線視覚」), supernatural powers frequently include the capability to hide from related powers (e.g., 「
知覚されにくい」 (「
超感覚」), for Antipsi power), and so on.
才能 benefits Power Block attempts (see p. 168) and adds to rolls to hit with 「
離れた地点に効果」 abilities.
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