Spells, features, and other effects that deal thunder damage, that teleport or conjure creatures or objects, or that require hearing to take effect have no effect within a 30-foot radius around you for the duration. If such effects target creatures or objects in the area or the targets of such effects enter the area, those effects are suppressed. The duration of each suppressed effect continues to elapse.
In addition, whenever an enemy in the area casts a spell with verbal components, that creature must make a saving throw using its spellcasting ability unless the spell is at least 7th level or uses a spell slot of at least 7th level. On a failed save, the creature takes 4d10 thunder damage and can’t cast the spell but can choose another action. On a successful save, the creature casts the spell and takes half damage (which may force it to make a Constitution saving throw to maintain concentration on a spell, including the spell it just cast).
At Higher Levels. When you cast this spell using a spell slot of 8th level or higher, the radius increases by 10 feet per slot level above 7th and the level of spells that this spell interferes with increases by one level for each slot level above 7th.
* - (a musical instrument)
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