Steam Whistle 2014

8th-level evocation

Casting time: 1 action
Range: Self
Components: V, S, M (a small brass whistle)
Duration: instantaneous
Save: Constitution

You open your mouth and unleash a shattering scream. All other creatures in a 30-foot radius around you take 10d10 thunder damage and are deafened for 1d8 hours. A successful Constitution saving throw halves the damage and reduces the deafness to 1 round.

Source: Deep Magic for 5th Edition (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details