| totoro |
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The rather wonderful idea to make Illusions less susceptible to Detect Magic got me thinking. This might be the time to finally get Illusions right, like REALLY right, in PF, because they have always been a little lame and situational. So, if you will indulge me, I’d like to talk a little bit about the most ubiquitous of illusionists in the real world: peppers (as in, jalapeño peppers).
Humans detect heat via a biochemical reaction to infrared radiation. The greater the amount of radiation, the faster the biochemical reaction. It happens in your mouth if you eat hot food and on your skin if you sit near a fire. Peppers trigger the exact same biochemical reaction. Unless you know it is a pepper that is causing it, your brain cannot tell the difference between the triggers. Accordingly, I think the simplest of all illusionary signatures should be the thermal signature, which D&D illusions have traditionally not been able to pull off until 3rd Level. There are a few animals (some snakes and bats) in the natural world that are capable of a form of heat vision, which they accomplish using heat sensitive pits in their noses, but most, including humans, can only detect magnitude. I think an illusionary thermal signature should cover both of those and should work regardless of the INT of the target; if it can feel infrared radiation, you can trick it with illusion.
The easiest signatures to mimic in D&D have always been sound (audible glamour) and vision (silent image). I think they should work just like a thermal signature in that anything with eyes can have a visible signature mapped onto its retina and anything with eardrums can have a sound mapped onto its eardrums (I guess?). The visible signature is a bit tricky because the illusion cannot create its own visible light, so at relatively low levels of control, the mapping onto the retina should only occur if the eyes are directed toward the illusion and are already detecting visible light. Although an illusionist should not be limited to no-light illusions, if you don’t do it that way, then the illusion of a person carrying a torch would not cause you to see the wall behind the illusion, which should have been illuminated by the torch (because there isn’t actually any light). I would include darkvision illusions as just another aspect of a visible illusion, but a reasonable person could also decide a darkvision signature is different than a visible signature.
Illusions with smell are also traditionally higher-level, but a particulate signature should not be much more difficult to pull off than a thermal signature, IMO, because they are both biochemical reactions. I would combine olfaction and gustation into a single signature, but would imprint slightly differently depending whether you sniff or lick the illusion. Almost all animals are capable of smell (absent abnormalities) and all macroscopic animals are capable of taste (not sure about microscopic, but some of microscopic animals can taste, too!). Accordingly, an illusionist should be able to map an illusion onto the olfaction and gustation receptors of any multicellular animal or animal-like creature, regardless of INT.
A first signature we can detect in real life, but that is not mentioned in illusion spells is what I would characterize as “vibration,” including infrasound and tremors. I think they should have their own signature as distinct from audible signatures because they are not mapped onto the ears. Again, any creature that is capable of feeling vibrations should be susceptible to such illusions, regardless of INT, which includes pretty much all macroscopic animals. You would need this to make an illusion of a gargantuan creature stomping towards you to feel real.
Some other senses common to many real animals include balance, time, pain, hunger, thirst, and direction (magnetoreception—not very strong in humans, but there is some indication it exists).
A sense that deserves special mention is the kinesthetic sense, which an illusionist would need to trigger if the illusion changed the target creature (e.g., by growing tentacles or something). This sense, also known as proprioception has even been detected in flowering land plants! As you may be able to guess from what I have said about INT before, yes, I think this illusion should work on certain plant creatures. I would make this include pretty much all of the plant senses, making the plants do a bonsai or grow around a void or the like, all using illusion.
Some signatures for animals that humans do not have are electroception, detection of polarized light, and detection of water pressure and currents. An artificial sense that might be worth mentioning is X-Ray, which a transmuter might use to pierce illusions if the illusionist didn’t include it. An illusionist should be able to manipulate all of these.
Now I get to the signatures that don’t exist in real life, only one of which is magic, the signature that was added to all illusions, in a sense, by making illusions harder to identify with Detect Magic. There should be a signature for every single possible detection spell, including Detect Animals and Plants (e.g., an Animal Signature or a Plant Signature), Detect Evil, Detect Poison (e.g., a Poison Signature), Detect Scrying (makes you think there is scrying when there is not or hides scrying attempts), Detect Secret Doors (makes you think it is secret--and they just got lucky finding it or they cannot find the illusion with the ability to detect secret doors), Detect Thoughts (e.g., a Surface Thoughts Signature and, maybe with some more complexity, a Deep Thoughts Signature), Detect Snares and Pits (e.g., a Trap Signature), and Detect Undead.
With all of these possible signatures for illusions, the illusionist character can impact a wide range of different creatures, including those that are non-intelligent. They can do crazy stuff like make a person think they have been walking for hours, when it has been seconds, and that they are starting to feel pain in their feet from blisters, thirst, hunger, etc. The greatest of illusionists can treat any living thing like a brain in a jar, where the illusionist provides whatever stimulation he wishes and shuts out all other (real world) stimuli. You don’t even need to introduce the semi-real phantasms to make this specialty really powerful.
Sorry to go so long.