Deep Magic Volume 2 (p.138)
Amplify Sound
1-level Divination
Casting Time: 1 action
Range/Area: 120ft.
Components: Somatic, Material
Materials: a small cup and a bit of string
Duration: Concentration, 1 minute
You turn your attention to a point you can see within range, creating an invisible sensor in that location. For the duration of the spell, you hear sounds from that point as if you were in its space.
If the space where the point is located is subjected to thunder damage, you take the thunder damage as if you were in the space, but you don’t suffer other effects associated with that thunder damage. For example, if a creature casts the thunderwave spell, and the point you chose is within the spell’s area, you take thunder damage as if you failed the saving throw, but you aren’t pushed. A creature that can see the sensor (such as a creature benefiting from see invisibility or truesight) sees a thin, luminous string winding from the sensor to you.
Available for: Bard, Cleric, Ranger, Sorcerer, Wizard