GURPSよろず

Fictional 「気温制御」 takes two main forms:

Active:
　Psis, supers, and ultra-tech machines cause temperature changes using force of will or weird beams.
Freeze rays and cryokinesis call for Cold (-50%), while heat rays and pyrokinesis require Heat (-50%). For dramatic effects like freezing or boiling water instantly, add 「準備時間減少」 (+20%/レベル); each level doubles the rate of cooling or heating.

Passive:
　Spirits, monsters, and elemental creatures of heat and cold sometimes alter the temperature in their immediate vicinity (a two-yard radius) at all times. To simulate this, add 「常時起動」 (-10%), 「放射」 (-20%), and either Cold (-50%) or Heat (-50%). The ambient temperature changes by 2° per level per second the entity remains in the area, to the usual maximum of 20° per level.

■代替案（Alternatives）
　「気温制御」 doesn’t directly affect the temperature of people or things --only that of an area. The extremes of ambient temperature are dangerous, but the effects are too gradual to affect combat (see Cold, p. B430, and Heat, p. B434). To use heat or cold as a weapon, take 特殊攻撃 (p. 53). Heat is a Burning Attack, while cold is a Fatigue Attack with the Freezing enhancement (see Hazard, p. B104).

■パワーアップ（Powering Up）
　「気温制御」 is appropriate for 「サイコキネシス」 power, elemental Cold/Ice and Heat/Fire powers, and divine and spirit powers associated with ice goddesses, fire elementals, etc. In some settings, it even suits moral powers: cold represents lifestealing Evil, while heat can go either way . . . the flames of Hell are Evil, but the sun and life-giving warmth are Good. Weather-control powers often include this ability, usually with high levels of 「範囲に効果」.
才能 adds to degrees per second of temperature change after all modifiers, but has no effect on the maximum change. It also adds to Power
Block attempts (see p. 168).