Thermalsight (3.5e Creature Ability)
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Thermalsight
Thermalsight gives creatures the ability to sense heat sources. Creatures with thermalsight see a slight glow around heat sources. This exists even without a light source. Thermalsight tells only the rough direction of heat, not exact position. The creature usually does not need to make Spot check to notice creatures within range of its thermalsight ability (though it must have line of effect to a creature or object to discern that creature or object).
Unless noted otherwise, thermalsight is continuous, and the creature need do nothing to use it. Some forms of thermalsight, however, must be triggered as a free action. If so, this is noted in the creature’s description. If a creature must trigger its thermalsight ability, the creature gains the benefits of thermalsight only during its turn.
This sense can be blocked with a foot of stone, or two feet of earth. However, in water the range increases by 25%; and if touching metal that connects to the heat source, range also increases the same amount.
- Thermalsight never allows a creature to distinguish color or visual contrast. A creature cannot read with thermalsight.
- Thermalsight does subject a creature to gaze attacks, and creatures are dazzled if they fail the save. Blinding attacks do penalize creatures using thermalsight.
- Thermalsight works underground, and in a liquid and gaseous substance. Thermalsight negates displacement and blur effects.
- Thermalsight shows heat not just life forms. Thus when in a hot environment or when all surrounding objects are hot, there is a -2 penalty to Spot checks. The effectiveness of this ability depends on the ambient temperature in which it is used. It cannot help a creature detect objects colder than the surrounding area.
- Thermalsight sees through visual figments and glamers that do not incorporate heat (i.e., can see through minor image but not major image) and invisibility. However, creatures with thermalsight are still vulnerable to illusions that do not rely on vision (like ventriloquism).
- Thermalsight can only see creatures with heat signatures. Thus, Constructs, Ooze and Undead type, and Incorporeal, Ethereal, Air, Cold and Earth subtype creatures are invisible to this ability. However, Fire subtypes can be seen.
- Magical darkness negates this effect.
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