Silence A5E
2nd-level illusion (ritual)
Until the spell ends, a bubble of silence envelops the area, and no sound can travel in or out of it.
While in the area a creature is deafened and immune to thunder damage. Casting a spell that requires a vocalized component is impossible while within the area.
Other versions
Source: Adventurer's Guide (EN Publishing) · License: Creative Commons Attribution 4.0 / OPEN GAME LICENSE Version 1.0a details