Message

Divination Cantrip
Casting Time: 1 action
Range: 120 feet
Components: VSM (a short piece of copper wire)
Duration: Instantaneous

You point your finger toward a creature and whisper a message.
Target. One creature within range.
Effect. You whisper a message. The target (and only the target) hears the message and can reply in a whisper that only you can hear. You can cast this spell through solid objects if you are familiar with the target and know it is beyond the barrier. The spell doesn't have to follow a straight line and can travel freely around corners or through openings.
Special. Magical silence, 1 foot of stone, 1 inch of common metal, a thin sheet of lead, or 3 feet of wood blocks the spell.
Cantrip Progression. This spell improves in certain ways when you reach higher levels. At 5th level, the spell has a range of 300 feet. At 11th level, you can ignore the somatic and material components of the spell. At 17th level, you can also ignore verbal components of the spell, sending messages to your target telepathically instead. The spell can incorporate a simple mental image, and your target can reply in the same way. At 23rd level, the spell can now penetrate up to 5 feet of stone, 5 inches of common metal, 1 inch of lead, or 15 feet of wood. At 28th level, the range of the spell becomes 1 mile.

Source: PHB 259, SRD

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