Daggermaster

You prefer the dagger to all other weapons. As a result of your specialization, you are capable of extreme feats with a dagger in combat. 

Hidden Blades

As long as you are minimally dressed, any creature that tries to either visually or physically search you for hidden weapons has disadvantage to see or find all your daggers. You also gain the Sleight of Hand skill if you do not already have it. 

Throwing Expertise

Starting at 3rd level, when you make a ranged weapon attack with a dagger, the normal range increases by your proficiency bonus times 5' and the long range increases by your proficiency bonus times 10'. For example, at level 3 with a proficiency bonus of +2, the range for daggers you throw becomes 30/80 instead of 20/60. At 17th level with a proficiency bonus of +6, your range for thrown daggers becomes 50/120.

Slashing Dagger

Starting at 3rd level, when you make a melee attack with a dagger, you may choose to deal slashing damage instead of piercing damage. 

Sudden Strike

Starting at 9th level, you can use your Cunning Action to make an additional dagger attack against any creature you can see that is within range. This attack does not provoke an opportunity attack against you if it normally would. 

Deep Cut

Starting at 13th level, when you deal Sneak Attack damage with a dagger, you add your proficiency bonus to the damage. 

Blinding Barrage

Starting at 17th level, once per long rest, as your regular Attack action, you may make ranged dagger attacks against up to six separate targets within range that you can see. Any creature you hit must make a DC20 Dexterity saving throw or be blinded for one round. You must possess one dagger for each target.