If the person is wearing hard armor, you cannot see through it. Such an intense body search, with narrowly focused, high-power emission is very easy to detetect using darksense, and as such is at the same level as a body search - applied only when needed and/or expected.
>> Is darksense a 360° sense? >> Well hearing is a 360° sense, and darksense is a form of sending out >> sound and hearing the echo. However, assuming that the ultrasound >> emits from the trolls mouth, it will send a stronger sound in the >> forward direction than backwards. It is easier to hear someone if he >> is facing you when he is talking. Therefore, the darksense is >> significantly better in the direction the troll is facing, but it is >> fairly good in all directions. You cannot sneak up on a troll from >> behind if the troll is using his darksense. If you need to surprise a >> troll, you need to hide nearby and wait for him to pass by close by.
By nature ultrasounds are very directionnal (the higher the frequence of a sound, the greater it's directionnality), so Darksense is at least as directionnal as eyesight.
> Can a troll use darksense for prospecting? Yes, but I do not think
> ultrasound can travel very deep in the mountain, so the usefulness
> is limited.$
Ultrasound cannot peneter in stone (or maybe no more than a few inches), making darksesne useless for direct prospection.
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