Sending

3rd-Level Divination
Casting Time: 1 action
Range: Unlimited
Components: VSM (a short piece of fine copper wire)
Duration: 1 round

You send a short message of twenty-five words or less to a creature with which you are familiar. The creature hears the message in its mind, recognizes you as the sender if it knows you, and can answer in a like manner 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 5 percent chance that the message doesn't arrive.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, you may either target an additional creature or your message can be twenty-five words longer for each slot level above 3rd. All creatures targeted by this spell receive the same message, but only one target you designate when casting this spell can respond.

Source: PHB 274, SRD

Changelog

Added upcasting option.
Altered spell school to Divination from Evocation.