LevelCasting TimeRangeComponents
21 action (ritual)120 feet (sphere 20')V, S
Up to 10 minutes (C)Illusion

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.