Hush

Supernaturally, the spell freezes radiating soundwaves from around the caster for a certain amount of time (usually a few minutes). This spell is simple but amazingly versatile because it doesn't freeze incoming soundwaves. Since soundwaves would reflect from a person, those would seem to radiate on something like sonar. Instead, those sounds are consumed by the field of the spell. It can also prove a detriment, though; since the air is hushed, chants and prayers cannot be executed. Therefore, spellcasting is impossible until the enchantment wears off. This spell can also be tailored to target others to hush their own spellcasting. The spell lasts only a few minutes at the longest, and unless the caster knows what he or she is doing, it is possible to forget this spell is active.