Well, I finally figured out how pallidition is supposed to work.
Pallidition is a magnetic magic, that pulls objects towards it. However, in order to do this, it requires an essence of the substance that it attracts.
Rubrite also has some magnetic qualities, but only on objects they touch, not at a distance, and naturally moves those objects. Pallidite does not move objects, but rather they remain attached to its surface.
Being a very simple system, it would have a number of different uses once people figured out proper essences. It could be used to hang things up, keep things in place, and such. Theoretically, one could also use it to attract body parts out of their owner, at least at short range (I don’t imagine pallidition working at a range of more than a few feet, if that, although perhaps a melanite battery could expand the range of it, perhaps). Though wiring the essence properly would probably be tricky and not nearly as efficient as just using a spear or a gun.
I might say that pallidite would be used in all the places a magnet would be used, but the applications would at least be significantly expanded, owing to the fact that pallidite could be modified to work on any number of substances, not just metals.