The ornate jewelled dagger is shrouded in writhing tendrils of purple and black smoke, punctured with the anguished faces of past victims. Sages believe that the smoke may in fact be whispers of the blood of the God of Death.

The magic weaved into the cold iron blade means that any poison delivered by it is injected deeply into it's target. (Poison save DC is increased by 2).

Damage dealt by the blade is necrotic.

You gain a +3 bonus to attack and damage rolls made with this magic weapon.

Curse of Khanjar-Khan

Any victim slain by this dagger cannot be restored to life unless the killer speaks their name while attuned to the dagger and frees them by blowing their likeness from the writhing smoke

Shadow Assassin

The dagger can be imbued with an attuned wielders life force (Hit Dice).
An identical copy of the wielder is made from shadow and it holds the dagger.

The copy sounds feels smells and looks the same. It can become incorporeal and can pass through objects but the dagger cannot. It can make one attack and then it vanishes, dropping the dagger. The wielder can share its senses until the attack is made. The apparition requires the wielder to concentrate to maintain it.

Venom Attack

You can use an action to cause thick, black poison to coat the blade. The poison remains for 1 minute or until an attack using this weapon hits a creature. That creature must succeed on a DC 15 Constitution saving throw or take 2d10 poison damage and become poisoned for 1 minute. The dagger can't be used this way again until the next dawn.

Proficiency with a dagger allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: Bonus: Magic, assassination of a sentient being, Finesse, Light, Thrown