Pierre de communication (2/2)

Comes in pairs, with each smooth stone carved to
match the other so the pairing is easily recognized.
While you touch one stone, you can use an action
to cast the sending spell from it. The target is the
bearer of the other stone. If no creature bears the
other stone, you know that fact as soon as you use
the stone and don't cast the spell.
Once sending is cast through the stones, they
can't be used again until the next dawn. If one of
the stones in a pair is destroyed, the other one
be