SPELL_MUFFLE

Usage       : cast muffle <victim>
Accumulative: No
Duration    : 2 ticks
Level       : 28 Cleric
Mana Usage  : 50

Cast on a person failing the saving throw, this spell will effectively silence
the target. This includes speaking, shouting, emoting, casting spells, and just
about any other form of communication. There is no cure for this status effect.