Basic Rules
Level School Range / Area Components
2nd Level Illusion 120 ft / 20 ft V, S
Duration Casting Time Attack / Save Damage
10 Minutes 1 Action None None

For the duration, no sound can be created within or pass through a 20-foot-radius sphere centered on a point you choose within range. Any creature or object entirely inside the sphere is immune to thunder damage, and creatures are deafened while entirely inside it.

Casting a spell that includes a verbal component is impossible there.