I guess there are other specific questions that might go along this with but I was curious. I think the High Elves found a way to suppress their magic so they couldn't be sensed or was that the Highborne? However the question isn't just for the Elves but can any caster sense other magical users nearby and can they suppress it if it isn't some racial trait?
Another question would be if priests could use telepathy since a good majority of the shadow tree has them using mind based moves?