From Joseph Rapoport
In regards to creating simple communications in games, I play in two campaigns and DM one in which we have all arrived at the same solution for communication. The solution is an item, a small hollow metal tube, which acts like a Message spell.
The item comes in two forms:
- An expensive tube that doesn’t use charges
- A less expensive tube with charges that must continuously get recharged (great way to suck wealth from the party)
The party can communicate with anyone else they know who also has one of these items, as long as they are on the same plane. Prices are up to the DM.