You know how it is. You’re skulking through dark passageways to commit an assassination, and some annoying guard walks by. You try to kill him, but it takes four rounds, and meanwhile, he’s screaming his fool head off (before you cut it off, that is). This dagger removes that problem. Removing the guard is up to you.
Only those who have studied both the art of magic and the art of shivving someone in the giblets can craft one of these blades. Priests of assassin gods, actual assassins, and bards of a particularly larcenous nature are the usual makers.
Addendum: This should be considered a +1 dagger; the cost assumes the enchantment is about equal to another +1.
Dagger Of Silent Slaying
Aura faint abjuration CL 5th; Weight 1 lb.; Price 8,302 gp
This +1 dagger typically has a slim, slightly curved blade, and a hilt of ebony and jade. (However, many variations exist, and this is sometimes found as a different weapon type, though it is always a one-handed, light, melee weapon.) It makes no noise when drawn from its sheathe, when dropped, or even when struck against an object. On one occasion, this odd feature caused a target to believe the dagger was a silent image, and to laugh at how he’d seen through the wielder’s bluff, right up until the dagger slit his throat.
Anyone carrying the dagger on their person (but not in any kind of extradimensional space) gains a +2 circumstance bonus to Steath checks vs. hearing. However, the real utility of the dagger comes when it is used to inflict precision damage (such as sneak attack) on a target. The target cannot speak above a gargling whisper for 1d4 rounds, +1 round per die of precision damage. Each additional attack that deals precision damage while the target is silenced increases this by 1 round. “The more you stab, the more they shut up”, as the saying goes.
Anyone afflicted by this effect who casts a spell with a verbal component must make a caster level check at a DC of 15+Spell Level to do so. Language-dependent spells, and any spells with the [Sonic] descriptor, are ineffective: While they can be cast, they will simply not function, and the spell is lost. (Before deciding to attempt such a spell, the caster should get an automatic Knowledge (Arcana) or Spellcraft check (DC 13) as a free action if they are trained in either skill. If they succeed, they know not to waste their time. If they’re not trained in either, too bad. No free check. Any caster who doesn’t pump their relevant skills deserves to die.)
Construction Requirements: Craft Magic Arms and Armor; silence; must be able to do at least 1d6 precision damage. Cost 4,302