Sending stone

Sending Stones come in pairs that allow the user to cast the Sending spell to the holder of the corresponding stone.

Description
The stones are smooth and carved so as to be recognizable as one of a pair.

The Campaign of Vox Machina
Keyleth gave a stone to Pike so that the party could contact her in an emergency.

Campaign Two: The Mighty Nein
Lord Diedric Sutan had a sending stone which was stolen by Caleb Widogast during the party's break-in of the Sutan residence. The holder of the corresponding stone remains unknown.

Yussa Errenis and Allura Vysoren held corresponding stones. Yussa had instructed Wensforth to use it to contact help in the event of an emergency, and he did so when Yussa disappeared into the Happy Fun Ball.

Essek Thelyss gave a sending stone to Dagen Underthorn so that he could contact the party while they explored the ruins of Aeor in the event that the Tombtakers arrived.