OneSong

The OneSong-also called Weaver-Tongue- is the main communication method of Weaver spirits. Like in an insect hive, the OneSong connects them to each other and allows them to share data in a way much more faster than sound or speech.

Creatures who are able to hear or even understand the OneSong are likely to have accumulate much Weaver-Taint and most of them are already entangeled in her webs. Some like the Imbued are immune to its lure.

Source

 * Book of the Weaver