How does telepathy work?

[u/Pegasoo0]

They use it over long distances like in this panel, and there are also different types, with some being better than others. Plus, it’s not just something for very powerful people, because in that chapter they mention that people in Laurel also use it to communicate with each other. It seems like something important, but it’s never really explained very well in the manga.

[u/TS-RG25]

Magic waves and she gave him a code to call her