Bared Fang

 This +2 karambit dagger is crafted of bone and a bronze-like metal with an extremely fine, flowing runic script covering the entirety of the blade. The hilt of the dagger ends in a ring.

Any poison applied to this blade increases in save DC by 2. When you attack and hit a creature that is surprised with this dagger, it must succeed on a DC 18 Constitution saving throw or suffer 2d6 extra piercing damage from your attack.

Upon awakening, notches appear along the blade. The ring on the hilt now gives you advantage on any attempt to maintain grip or avoid being disarmed. When making a melee attack on a creature or structure, the blade will not come free unless the attuned character thinks the word "release". When engaged following an attack, the dagger can support or resist 8000lbs of force without moving, though the structure supporting it will experience those forces normally. A creature can use an action to make a DC 30 Strength check, removing the blade on a success.

Once per day, anyone attuned to fang can cast the Locate Object spell with Fang as the object without expending a spell slot or requiring material components.  

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, person already attuned to the dagger "Fang" for 3 character levels and who has used the dagger to kill at least 3 times. , Damage, Debuff, Combat, Finesse, Light, Thrown, Nick