"Catch!...Usually people do that with their hands, not their ribs."
Level 3
Master of Daggers.
You may use your Vicious Opportunist feature with thrown daggers.
My Lucky Dagger.
You always have a specific dagger (give it a name) in your inventory that does not count toward your inventory slots. If this dagger is not being held or observed by a creature, it instantly reappears in your sheath or pocket.
Level 7
Pinning Shot.
(2 actions) Make a thrown dagger attack. If you hit the target is Restrained until they spend 1 action to free themselves.
Level 11
Deadly from the Shadows.
(2/encounter) When you use your free Move or Hide action from the Cheat class feature, you may make one thrown dagger attack as part of that same action.
Level 15
Heartseeker.
Your dagger attacks crit on 1 less than normally needed.