GURPSよろず

see p. B61
If an ability causes injury and isn’t a natural melee weapon (like claws), it’s an 特殊攻撃. Given the variety of attacks possessed by powered heroes in comics, movies, and so on, this covers a lot of ground. The first step when designing any 特殊攻撃 is to choose its damage type:

Burning: Use this for electricity, flame, heat, and radiation. Examples include fireballs, lasers, lightning bolts, microwaves, and particle beams. Enhance the attack with Explosion (+50%/レベル) for a fireball, Radiation (+100%) for a particle beam, or Surge (+20%) for lightning.
Exotic attacks might require combinations of damage modifiers: Radiation and Surge for charged particle beams, Explosion and Surge for ball lightning, Surge and No Wounding (-50%) for an electromagnetic pulse (EMP) that only harms electrical systems, etc.

Corrosion: Realistic examples are strong acids and bases. Powerful oxidizers also qualify, and tend to be Incendiary (+10%). Magical, superpowered, and superscience disintegration effects fall into this category, too.

Crushing: This is most appropriate for attacks that hurl large, blunt chunks of matter, like balls of stone or ice (but not bullets --those are piercing).
Superscience force beams qualify as well. 爆発物 are crushing attacks with both Explosion (+50%/レベル) and Fragmentation (+15%/die); timed explosives, such as grenades, add 「遅発」 (variable).

Cutting: Cutting attacks nearly always involve blades or shards, which might be made of bone, glass, ice, metal, or any number of other things.
Tiny shards that damage mainly as a result of their sharpness have No Blunt Trauma (-20%) and No Knockback (-10%). Cutting attacks are often carriers for venomous Follow- Up attacks.

Fatigue: Tranquilizers are the obvious real-world example, and have 「周期的」, 「遅効」, and 「抵抗可能」 (all highly variable). At higher TLs, sonic and electrical stunners become possibilities.
Supernatural options include sleep spells and psionic mind blasts.
Fatigue is the only damage type that can have Hazard enhancements (see p. B104). It can’t harm inanimate objects, but with Hazard, the GM may let it affect them --Freezing could cool off a cheeseburger, Suffocation might deprive an engine of air, and so on.

Impaling: The notes for cutting damage apply here as well, but No Knockback isn’t allowed --impaling attacks don’t cause knockback in the first place.

Piercing: The most common example is a bullet or bullet-sized projectile.
See below for detailed notes on projectiles; see 銃器 as 特殊攻撃s (box) to simulate firearms.

Toxic: Realistic poisons and diseases have 「周期的」, 「遅効」, and 「抵抗可能」 (all variable) --but supernatural death touches, evil eyes, etc. also qualify as toxic, and often lack these modifiers. A direct, physical attack that delivers a rad dosage instead of injury has Radiation (+25%).
Next, define how the attack delivers its damage:

Beam: Supers and energy weapons frequently project damaging rays.
Most are burning, and don’t absolutely require modifiers --but lasers have 「徹甲除数」 (2) (+50%) and blasters have 「徹甲除数」 (5) (+150%).
Disintegration beams cause corrosion damage, often with 「徹甲除数」 (10) (+200%) or 「宇宙パワー」 (+300%).
Force beams are crushing, typically with Double Knockback (+20%); most other crushing beams have No Knockback (-10%). Stun beams inflict fatigue damage. Only “death rays” (supernatural or superscience) are likely to deliver toxic damage. Roll against 特殊攻撃 (Beam) to hit with any kind of beam.

Curse or Mental Blast: Damaging supernatural effects that bypass DR might do any kind of damage. Use burning for pyrokinetic attacks; fatigue for nonlethal attacks, with Freezing (+20%) for cryokinesis, Missed Sleep (+50%) for a sleep spell, and so on; or toxic for a death spell or telekinetic attack. Add 「呪文状」 1 (+100%) for spells or 「呪文状」 2 (+150%) for psionic abilities. See 「特殊効果」 (p. 39) for additional notes.
Since there’s no physical impact, add No Knockback (-10%) if damage is crushing or cutting. 「呪文状」 uses a Will roll, not a standard attack roll.
Field: Most constant, injurious effects that surround the user --sheath of flame, radiation zone, aura of withering, etc. --are burning or toxic, with 「オーラ」 (+80%), 「常時起動」 (-40%), and 「白兵攻撃」 (-30%). Those who attack by emitting an expanding ring of fire, ice, poison, etc. from their body have 「範囲に効果」 (+50%/レベル) and 「放射」 (-20%) instead, with damage type depending on the substance or energy involved. Neither requires a roll to hit --but to use an 「オーラ」 actively calls for an unarmed melee attack.

To simulate a firearm, start with dice of Piercing Attack equal to its damage. Adjust Acc using 「正確」 (+5%/レベル) or Inaccurate (-5%/レベル); Range using 「有効距離延長」 (+10%/レベル) or 「射程減少」 (-10%/レベル); RoF using 「速射」 (variable); Shots using 「回数制限」 (variable), usually with Fast Reload; and Rcl using 「追加反動」 (-10%/レベル). If using Optional Rule: Malfunction (p. B279), add 「信頼できない」 (variable) to give the attack a Malf. Realistic guns almost never have the 「手加減可能」 enhancement. For worked examples, see Built- In Firearms (p. 136).

■Ammunition
特殊攻撃 can also simulate different ammunition: add 「徹甲除数」 (2) (+50%) and make the attack small piercing for armor-piercing ammo; add 「徹甲除数」 (0.5) (-30%) and change the attack to large piercing for hollow-point; add 「徹甲除数」 (0.5) and Incendiary (+10%) for tracer. Specialized ammunition might be non-piercing; e.g., flechettes are impaling.

■Other Details
Considerations such as caliber and cartridge length are “special effects” (see Special Effects, p. 113). They can matter in play --e.g., when forced to reload from captured ammunition --but don’t alter point cost.
The same is true of Shots too generous to qualify for 「回数制限」: the designer should still give a number. He might not run out in 10-second firefight . . . but he could run out on a four-day mission. The GM may require a Shots statistic close to that for a comparable weapon in the game world. This isn’t a limitation; it’s no different from the GM ruling that someone who tosses fireballs all day gets tired (see Abilities and Exertion, p. 159).

Gas:
　 Lethal gases inflict toxic damage; nonlethal ones, fatigue damage.
Fictional breath weapons have 「円錐状」 (variable), but supers and wizards who can create gas clouds should take 「範囲に効果」 (+50%/レベル) instead. Add one of Respiratory Agent (+50%), 「血液感染」 (+100%), or 「接触感染」 (+150%) to any gas attack.
「浮遊」 (+20%) and 「持続」 (+40%) are useful for lingering gases --and the GM might even allow these with 「円錐状」.
Use 特殊攻撃 (Breath) to hit with a 「円錐状」. 「範囲に効果」s that depend on a beam, gaze, or projectile use the appropriate 特殊攻撃 specialty to hit.

Liquid:
　 Liquids have 「円錐状」 (variable) or 「噴射」 (+0%); fantasy breath weapons with 「円錐状」 should have 「射程減少」, ×1/5 (-20%), too.
Acids inflict corrosion damage, while flaming liquids cause burning damage; either might be 「周期的」 (variable), if it sticks to the target. Water jets are crushing --often with Doube Knockback (+20%) and No Wounding (-50%). 毒物 inflict either fatigue or toxic damage, and have one of 「血液感染」 (-40% for 「噴射」, +100% for 「円錐状」), 「接触感染」 (-30% for 「噴射」, +150% for 「円錐状」), or Respiratory Agent (+50%). Roll against 特殊攻撃 (Beam) or (Breath) to hit with liquids that issue from the hand or mouth, respectively.

Projectile:
　 Projectiles don’t require modifiers, but are among the few attacks that are routinely Guided (+50%), Homing (variable), or lobbed 「曲射」 (+30%). They can deliver almost any kind of damage: burning for fireballs, crushing for stones, impaling for ice spears, and so on.
Storms of fire, stones, ice, etc. are common magical and super attacks, and have 「範囲に効果」 (+50%/レベル) -- with 「持続」 (+40%) and possibly Wall (+30% or +60%) if they stay in place for some time, and often 「爆撃」 (variable). To emulate firearms, see 銃器 as 特殊攻撃s (p. 54). Use 特殊攻撃 (Projectile) to hit.

Touch:
　 Most natural body weaponry is just 「爪」, 「攻撃部位」s, or 「歯」 -- but a melee attack that operates independently of the user’s ST is an 特殊攻撃 with the 「白兵攻撃」 limitation (variable). Use this option for an angel who can summon a sword of flame (burning), a robot with a builtin force sword (cutting), or a kung fu master who attacks with a deadly touch (toxic). Add 「接触感染」 (-30%) to attacks that must strike bare skin, 「宇宙パワー」 (+300%) to supernatural attacks that completely circumvent DR, like the Deathtouch spell (p. B245). Make an unarmed melee attack to hit.

Venom:
　 Poison on 「爪」, 「歯」, etc. should cause fatigue or toxic damage unless it’s very unusual. Such attacks always have 「追加発動」 (+0%).
Make a melee attack to hit with the carrier attack.
Finally, if the attack has a chance of causing a baneful effect in addition to injury if it penetrates DR, add 「副次効果」 (variable). This is common for beams that emulate ultra-tech stunners, paralysis guns, and so on. If the attack automatically causes weakness or incapacity after inflicting enough injury, enhance it with Symptoms (variable) instead. Fatigue or toxic attacks that represent venom or poison gas generally have Symptoms.

　「特殊効果」 (p. 39) is a far better starting point for a completely nonlethal attack . . . and the Coma and Heart Attack enhancements make 「特殊効果」 a superior “all-or-nothing” lethal attack, too. To punch, kick, or strangle opponents at a distance, buy 「テレキネシス」 (p. 82).

　Any power that isn’t completely nonviolent might have an 特殊攻撃. Match both damage type and means of delivery to the power’s focus and source; see above for many examples.
In all cases, 才能 gives a bonus to hit.

Innate Attack
see p. B61
Use Innate Attack to create the “chi blasts” wielded by martial artists in video games and comic books. These take many forms: flaming breath, devastating kiais, “weapons” of pure chi, and so on. Some of the more improbable claims made for legendary masters in the real world would also be Innate Attacks, such as blows delivered from a distance, direct psychic attacks, and the sinister “hand of death.”
If the GM allows such abilities, he should limit damage to keep Innate Attack from eclipsing the fists, swords, bows, and so forth that martial artists usually use, even in video games. Martial-arts tradition provides convenient guidelines: these abilities draw their strength from the same well as the martial artist’s unarmed attacks – his chi – and should inflict comparable damage. Since most of these exotic attacks violently expend the user’s chi, they should cost FP. This provides a convenient hedge against overuse.
Such an attack should still be a useful alternative to an ordinary punch, though. Otherwise, who’d waste time developing it? Fitting capabilities include non-crushing damage, ongoing injury (like poison), the capacity to partially or wholly bypass DR, and range.
Below are worked examples of suitable abilities. Damage is 1d, equivalent to a strong man’s punch. In each case, the sum of the modifiers used appears in parentheses after the attack’s name. To alter damage, apply this total modifier to the cost of an Innate Attack of the desired size.

Breath of Dragon (-25%): Burning Attack 1d (Costs Fatigue, 1 FP, -5%; Melee Attack, Reach 1-4, Cannot Parry, -20%) [4]. Notes: A narrow flame jet – spewed from the mouth – that can scorch a target up to four yards away. This counts as a melee attack. Take an Attack maneuver and roll against Innate Attack (Breath) to hit. 4 points.
Flying Fists (+0%): Crushing Attack 1d (Blockable, -10%; Costs Fatigue, 1 FP, -5%; Low Signature, +10%; Variable, +5%) [5]. Notes: By punching or kicking at air, you can smite a distant target. If the victim has never witnessed this ability, he must make a Sense roll at -4 to know he’s being attacked! (He may defend normally against later uses.) It’s otherwise a standard ranged attack with Acc 3, 1/2D 10, Max 100, and RoF 1. To use it, take an Attack maneuver. Roll against Karate to hit. 5 points.
Ghost Knife (-40%): Impaling Attack 1d (Blockable, -10%; Costs Fatigue, 1 FP, -5%; Inaccurate 3, -15%; Increased 1/2D, ×5, +10%; Reduced Range, ×1/5, -20%) [5]. Notes: A hurled blade of pure chi, this is a standard ranged attack with Acc 0, 1/2D 10, Max 20, and RoF 1. To use it, take an Attack maneuver and roll against Thrown Weapon (Knife) to hit. 5 points.
Hand of Death (+205%): Toxic Attack 1d (Contact Agent, -30%; Cosmic, Lingering special effect, +100%; Costs Fatigue, 2 FP, -10%; Cyclic, 10 sec., 6 cycles, Resistible, +125%; Delay, Triggered, +50%; Low Signature, +10%; Melee Attack, Reach C, -30%; Resistible, HT-4, -10%) [13]. Notes: To deliver the Hand of Death, you must touch bare skin. This requires a Karate roll in combat, an ordinary touch otherwise. Only witnesses with the Esoteric Medicine skill will recognize the Hand. Success means you can – at an unspecified future date, from any distance – trigger the Hand. The victim must then roll HT-4 every 10 seconds for a minute. Each failure means 1d injury, as if from poison. There’s no way to remove an untriggered Hand or interrupt its toxic effects. Survivors heal normally. 13 points.
Mega-Kiai (+75%): Crushing Attack 1d (Accessibility, Not in vacuum, -10%; Based on HT, +20%; Costs Fatigue, 1 FP, -5%; Malediction 1, +100%; No Blunt Trauma, -20%; No Knockback, -10%) [9]. Notes: Similar to the Kiai skill (p. B203), this mighty shout injures the target! To affect the victim, take a Concentrate maneuver and win a Quick Contest of Will vs. his HT. Your roll is at -1 per yard of distance between you. 9 points.
Soul Blast (+170%): Fatigue Attack 1d (Malediction 2, +150%; No Signature, +20%) [27]. Notes: This invisible psychic attack disrupts the victim’s chi. To affect him, take a Concentrate maneuver and win a Quick Contest of Will. Range penalties from the Size and Speed/Range Table (p. B550) apply to your roll. This chi attack doesn’t cost FP like the others . . . it’s slow and subtle, not violent. 27 points.

Some of these abilities resemble weapons or unarmed attacks, and allow attack rolls against normal combat skills instead of the Innate Attack skill. This is a “special effect” aimed at preserving the martial-arts flavor. It doesn’t affect point cost.
Normally, the only legal defense against a ranged Innate Attack is a dodge. However, a few of these attacks have the Blockable limitation or Melee Attack limitation, which lets the target attempt a block or parry. Others are Maledictions, which can be resisted but not avoided.
Innate Attacks are unrealistic and strictly for over-the-top cinematic games – and even then, they have Trained by a Master or Weapon Master as a prerequisite.