Colloquy

You initiate a telepathic communication with a creature of with which you are familiar with, and have conversed with for at least 1 minute in person. You and the creature can communicate with one another and hear each other's messages in your minds. The creature recognizes you as the messenger and can choose to answer or decline the spell. A creature that rejects the spell causes it to end immediately. The spell enables creatures with Intelligence scores of at least 1 to understand the meaning of your message.

You can send the message across any distance and even to other planes of existence, but if the target is on a different plane than you, there is a 25 percent chance that the message doesn't arrive, causing the spell to fail.