Rare Weapon (Dagger), Finesse, Light, Thrown (20/60), Requires Attunement

Lost for Words. (Recharge 5-6). When you hit a creature with this weapon, you can create the effects of the Silence spell centred on them. This effect lasts until the end of your next turn. 

Curse of the Mute. Once per short rest, when you hit a creature with an attack made with this weapon, you can force them to make a DC 15 Wisdom saving throw. On a failure, they become deafened and unable to speak for 1 minute. At the end of each of their turns, the target can repeat the saving throw, ending the effect on a success. Silent Arcana. As a bonus action, you can choose a creature within 30 ft. of you and gently slice yourself with the blade, expending one of your Hit Dice. Until the end of your next turn, the target can cast spells without requiring verbal components.