It is... not magic as I have seen it here. When I was asking for memories in creating my commission, I used it often. It was most commonly described by those who worked willingly with me as a sort of telepathy.

All Eldar have the ability, but it is also a skill to be honed. It is a way to communicate without spoken word. To read the thoughts and emotions and motives of another. To understand them in ways more subtle than most. It works well not only with other people, but with Ainur and beasts and even plants, wind, water, to a degree. If there is something that can be heard, being open through sanwe-latye can allow you to hear it.

To use it in a system would be to unveil plots of treachery while they are yet thoughts and not actions.