Greater Sending

5-level Evocation

You have a small conversation with a creature with which you are familiar. The creature hears you in its mind, recognizes you as the sender if it knows you, and both you and the creature can respond to each other until the spell ends. The spell enables creatures with Intelligence scores of at least 2 to understand the meaning of your message.   You can have this conversation across any distance and even to other planes of existence, but if the target is on a different plane than you, there is a 10 percent chance that the message doesn't arrive.
At higher levels: When you cast this spell using a spell slot of 6th-level or higher, the conversation can last up to 1 hour, provided concentration is maintained.