Skaldor's chest, and Plague Rat's nest. The words on the scroll read "Compressus". When used, enemies in the area will be unable to speak and a (~) will appear below their names. Due to the inability to speak, players cannot cast spells while silenced. Smile, frown, shrug and laugh are unaffected by the spell.
A Magic Skill level of 23 is required to use it.