Bloodthirsty Bistoury
This elegant, dark dagger is never bloodstained and effortlessly pierces flesh. You gain a +1 bonus to attack and damage rolls made with this magic weapon.
When this dagger is used by an evil-aligned creature, any creature hit by it doesn't bleed from the attack or the wound it leaves behind for 10 minutes.
He gasped and clutched his side as a stabbing pain blossomed through his senses. He looked down at his hand, expecting to see shimmering crimson. There was nothing. His hand was perfectly clean, but his robes were torn. He felt the flaps of a fresh and very sore wound in his gut, but there wasn't any blood there to speak of. Another moment passed, and the sharp pain streaked through him again, this time in his back. "Shhh, shh, hush now, your Excellency. Go quickly, cleanly, and quietly into the dark." As the assassin dragged the body away, the floors beneath them remained clean.