GURPSよろず

Negated Disadvantage:
　The victim loses a specific disadvantage for one minute per point by which he fails his HT roll. If he lacks that disadvantage, there’s no effect. This is worth +10% per point the disadvantage is worth. If the disadvantage comes in levels, specify the level negated.

Beam:
　A ranged attack that affects one target; e.g., a paralysis beam or a shrinking ray.
This is the most basic form of 「特殊効果」.
It’s especially suitable for supers, gods, and ultra-tech beam weapons. Roll against 特殊攻撃 (Beam) to hit.

Curse:
　Fantasy and horror 「特殊効果」s are more often “spells” than “bolts of power,” with the attacker calling upon supernatural forces to weaken or incapacitate his foe. The only requirement is 「呪文状」 1 (+100%). To simulate the spells on pp. B242-253, add suitable levels of 「FP消費」 (-5%/レベル) and 「準備時間増加」 (-10%/レベル). Most mental effects are Based on Will (+20%).
There’s never any roll to hit; 「呪文状」s use a 意志力判定instead.

Field:
　The user constantly emits a baneful effect; e.g., a demon might cause those who approach too closely to suffer Agony (+100%). If he affects everyone around him once, when they first come within range, take 「範囲に効果」 (+50%/レベル) and 「放射」 (-20%). If he automatically attacks anyone he touches or who touches him each time he makes contact, use 「オーラ」 (+80%) and 「白兵攻撃」 (-30%) instead. In either case, add 「常時起動」.
This is a -10% limitation, as 「特殊効果」s are socially inconvenient but not physically troublesome for the user. No roll to hit is required, but those with 「オーラ」 can actively try to affect a victim by making a melee attack.

Gas:
　Sleeping gas, paralysis gas, and the like. Such 「特殊効果」s have 「範囲に効果」 (+50%/レベル) and one of Respiratory Agent (+50%), 「血液感染」 (+100%), or 「接触感染」 (+150%). For a mobile gas cloud, add 「浮遊」 (+20%) and 「持続」 (+40%). A gas that surrounds the attacker has 「放射」 (-20%) instead. Insidious gases have No Signature (+20%) and possibly 「遅効」 (variable). There’s no roll to hit; gas has a chance of affecting everyone exposed to it.

Gaze:
　A gaze is a common vehicle for supernatural 「特殊効果」s. For instance, a hypnotic gaze might cause the target to sleep. If the gaze works on any target the attacker can see, it has the Vision-Based enhancement (+150%). Roll against 特殊攻撃 (Gaze) to hit. Gaze attacks by fantasy monsters tend to be short-ranged and curse-like; apply 「呪文状」 1 (+100%) and the Vision-Based limitation (-20%) instead. To affect the target, make the usual 意志力判定for 「呪文状」.

Mental Blast:
　Direct mind-to-mind attacks that stun or daze are common psi abilities. Such 「特殊効果」s have 「呪文状」 2 (+150%) and Based on Will (+20%). If the attack is totally undetectable, add No Signature (+20%). As with all 「呪文状」s, the only roll required is a Will roll.

Sensory Attack:
　Some 「特殊効果」s affect everyone nearby though their senses. Such attacks have 「範囲に効果」 (+50%/レベル) and 「放射」 (-20%).
Bright flashes are Vision-Based (+150%), with a Disadvantage enhancement that inflicts 「視覚障害」 (+50%); howls, thunderclaps, etc., are Hearing-Based (+150%), and cause Deafness (+20%). As with gas, no roll to hit is necessary --everyone in the area is exposed.

Touch:
　Monsters, wizards, and supers often have to touch those they wish to afflict. The simplest form of this is 「白兵攻撃」 (-30%). Attacks that must touch bare skin or an open wound have 「接触感染」 (-30%) or 「血液感染」 (-40%), respectively, while supernatural attacks that bypass DR get 「呪文状」 1 (+100%). Make an unarmed melee attack to hit. For 「呪文状」, roll the Quick Contest to see if the 「特殊効果」 works only after scoring a hit.

Venom:
　Toxins often cause weakness, paralysis, unconsciousness, coma, or heart attack. Those borne on fangs, claws, etc. have 「追加発動」 (+0%), while poisonous spray or spit has 「接触感染」 (-30%) or 「血液感染」 (-40%). Many poisons take time to work; if so, add 「遅効」 (variable).
Make a melee attack to hit with a natural weapon. Roll against 特殊攻撃 (Breath) to hit with spray or spit.
「特殊効果」s that do more than stun have special enhancements, too.
Effects might be inconvenient (Irritant, Negated Advantage, or modest levels of Attribute Penalty or Disadvantage), crippling (Incapacitation, or extreme levels of Attribute Penalty or Disadvantage), or lethal (Coma or Heart Attack). Note that Choking isn’t usually lethal --it responds to mundane treatment that takes two seconds and a 応急処置 roll (artificial respiration, oxygen mask, Heimlich maneuver, etc., depending on “special effects”).
The Advantage enhancement is a special case. It’s useful for specialized attacks; for instance, it might shrink the target (「縮小」, +50%/レベル) or turn him into a specter (「非実体化」, +800%). However, it’s also a key element of many beneficial abilities, which use special rules; see Beneficial 「特殊効果」s (box).
Remember that an 「特殊効果」 can have multiple effects. If an effect applies only if the victim fails his HT roll by 5+ or rolls a critical failure, it’s “secondary” and worth 1/5 as much. If the GM wishes, effects that require a critical success on the user’s roll (attack roll, 意志力判定for 「呪文状」, etc.) can also be secondary.

Finally, note that it’s often more cost-effective to add the 「呪文状」 enhancement than to buy high levels of 「特殊効果」. Against a high-HT target, a Quick Contest of Will vs. HT is more likely to succeed than an unopposed HT roll (even at a penalty) is to fail.

An 特殊攻撃 with the 「副次効果」 or Symptoms enhancement (see p. B109) can have 「特殊効果」-like effects in addition to damage. 「副次効果」 is better than 「特殊効果」 for simulating “reduced lethality” weapons.
Symptoms are generally superior for poisons and diseases that incapacitate with only moderate injury.
「癒し手」s should note that the 「治療できる」 advantage (p. 31) costs far less than 「特殊効果」 with Advantage, 「HP再生」.

Negated Disadvantage:
　The victim loses a specific 不利な特徴 for one minute per point by which he fails his HT roll. If he lacks that 不利な特徴, there’s no effect. This is worth +10% per point the 不利な特徴 is worth. If the 不利な特徴 comes in levels, specify the level negated.

Most powers can justify some kind of 「特殊効果」. Even wholly beneficial powers --Psychic 「治療できる」, the divine power of the God of Medicine, etc. --are likely to include 「特殊効果」s enhanced with Advantage or Negated Disadvantage, or with Ecstasy, Sleep, or Unconsciousness for use as an anesthetic. 才能 gives a bonus to rolls to hit with 「特殊効果」s, and benefits Will rolls in the case of 「呪文状」.