Dagger of Denial

Description
This silver stiletto blade bears intricate grooves that spiral from the point to the ivory hilt and handle. You have a plus two bonus to attack and damage rolls made with this weapon. While attuned to this dagger, you can spend an action to place the point of the blade into any keyhole and seal it shut. A keyhole sealed in this way cannot be unlocked until this dagger is placed into that keyhole once more. Attempting to seal a keyhole unseals any previous sealed keyholes.

The blade itself looks almost like Damascus steel, with spiraling grooves. It appears more like a stiletto, as opposed to like a bladed dagger.

History
The Mighty Nein found the dagger in the King's Cage, screwed into a wall of the room reflected in the mirrors.. When placed in the hands of a carved angel on the doors of the final chamber, it caused them to open, and to close again when removed. Nott brought the dagger with her as the party fled the King's Cage after fighting Obann, The Laughing Hand, and Yasha.

When Fjord lost his warlock powers temporarily by destroying the Sword of Fathoms embodying his pact with Uk'otoa, Nott gave him the dagger and he successfully wielded it against the remorhaz. He returned it to her when he regained his abilities and she used it to deface a glyph within the Permaheart room of The Folding Halls of Halas.

During the party at the Marquis Demesne in Nicodranas, when Jester lured Lord Robert Sharpe out onto a balcony, Veth used the dagger to lock the doors behind him.

Veth gave the dagger to Vokodo as part of her "offering" to be allowed to escape Vokodo's lair.