When this item is attuned it’s owner can dismiss it to a pocket dimension when holding it in his hand or summon it into his hand from the pocket dimension as a bonus action. After it is thrown it immediately flies back into to it's owner’s hand. It’s damage is magical for the purpose of overcoming damage resistance.
Proficiency with a Dagger allows you to add your proficiency bonus to the attack roll for any attack you make with it.
This weapon has the following mastery property. To use this property, you must have a feature that lets you use it.
Nick. When you make the extra attack of the Light property, you can make it as part of the Attack action instead of as a Bonus Action. You can make this extra attack only once per turn.
Notes: Humanoid, Finesse, Light, Thrown, Nick
I would clarify that "after its thrown" bit as it currently indicates the instant it leaves the hand it returns. I think you should clarify that if dropped or thrown it returns to the hand at the end of your turn. Or something. That way you can actually make a ranged attack with it. Otherwise, useful. Me likey.
Thank you