Prison Shank

 A brutal life has taught has taught you that daggers are extremely deadly in close quarters, granting you the following benefits:

• Increase your Strength or Dexterity by 1, to a maximum of 20.
• Once per turn when you hit a creature with a melee attack with a dagger, you can immediately make a second melee attack with the same weapon against the same target.
• When you score a critical hit with a melee attack to a creature using a dagger, you grievously wound it. Until the end of your next turn, you have Advantage on your next attack against that target using the same dagger.