Someone in a game I'm going to run wants to play a mage.
The Mage has both Improved Invisibility and Stealth.
If the Mage wants to sneak past a drone, the mage needs to beat the Object Resistance (OR) threshold of the drone.

On page 174:
OBJECT RESISTANCE TABLE
Category: Highly Processed Objects (Computers, Complex Toxic Wastes, Drones, Vehicles)
Threshold: 4+

So my question is, what is the OR threshold of a drone?
Is it equal to 4. Better than 4. Why would a drone have higher than 4?
Does a drones sensors do anything for its OR threshold or does the sensors only kick in if the drone can see the mage?

Are my questions clear?
Thanks for any help.

Thyme

Wouldn't you just have to beat the rating of the drone's camera in an opposed test?

a normal drone would have an OR 4.

a drone that is more processed than usual (i dunno, made out of processed diamonds or something by someone with more money than brains or something?) or more complicated than usual (gear beyond the SOTA, or if it's got an AI in it or something i suppose) then it would get higher resistance. also presumably if it was more toxic somehow, as i seem to recall that making stuff more resistant too...

How common would rating 6 cameras be?

Is the drone using an ultrasound camera?

Stealth takes care of the ultrasound. It does not take care of radar.

Assuming a drone has an array of different sensor options (higher the sensor rating the more likely this is) the harder it will be to sneak by just by just being invisible. Cameras allow a drone to see, it could be installed with motion detectors (probably ultra sound based working like sonar), active Sonar, passive Sonar, Radar in a variety of spectrums may be used, antennas for picking up EM emissions, seismic monitors for pickng up vibrations, Chemical "sniffers", Magnetic Anomaly Detectors. Pretty much if you can think of a reasonable sensor technology a high rated vehicle sensor suite could have it. You probably have a better chance of fooling the sensor in to thinking you are background noise, thereby having the sensor's software suite ignore you, than of completely evading detection.

I would say the OR is just 4, getting 4 sucesses is pretty difficult unless you are magic 6 spell casting 6, at whichpoint it is only average (50% chance to succeed).

On the other hand, since drones do have a sensor rating, it wouldn't be too difficult to make the threshold equal to the sensor rating.

It doesn't mater what type of wave it is. What matters is the type of organ that senses it. Light is sensed by a camera thus is a form of vision. Radar is sensed by a dish and is a nonstandard sense that cannot be defeated by any known spell.

The spell description states the following...

This spell makes the subject more difficult to detect by normal
visual senses (including low-light, thermographic, and other
senses that rely on the visual spectrum). The subject is completely
tangible and detectable by the other senses (hearing, smell, touch,
etc.). Her aura is still visible to astral perception.

Anyone who might perceive the subject must first successfully
resist the spell. Simply make one Spellcasting Test and use the hits
scored as the threshold for anyone that resists at a later point. Even
if the spell is resisted, the subject might remain unnoticed if she
wins a Shadowing or Infi ltration Test. An invisible character may
still be detected by non-visual means, such as hearing or smell.

Attacks against invisible targets suff er the Target Hidden
modifi er (p. 141) if the attacker is unable to see or otherwise
sense the subject of the spell.

Invisibility aff ects the minds of viewers. Improved invisibility
creates an actual warping of light around the subject that affects
technological sensors as well.

This tells me that anything that relies on the visual spectrum, not electromagnetic, is covered by the spell.

Since drones are not living targets they do not resist and you only have to beat a threashold based on object resistance. This would be 4.