Glyph of Silence

Description: A glyph, etched onto any object, carries a powerful enchantment. Upon being triggered by a command (V,S or M), the glyph activates an area of silence centered on the object it's inscribed upon.

Effect: A 20-foot-radius sphere of magical silence emanates from the object. No sound can be created within or pass through the sphere. Any creature or object entirely inside the sphere: is immune to thunder damage, is deafened for the duration & cannot cast spells that include a verba