The Injection Dagger

It's a slim bodied knife with a thin blade.
It's fixed with a botton in the shaft of the dagger.
The shaft has a space where a vile can be placed.
With a Bonus Action you can activate the poison
in the dagger.
When you hit a target with your attack, the target
makes a CON SAVE equal to the Poisons DC.
On a succesful save the target take half damage