Knifemaster

Rogue subclass that focuses on improving the use of daggers

Deadly Dervish

When you choose this archetype at 3rd level, you learn to take advantage of the unparalleled speed and balance of daggers to better exploit your enemies' weaknesses. If you have a dagger in both hands, you can add your ability modifier to the damage rolled, and throwing daggers at long range does not impose disadvantage on your attack rolls.

In addition, you can use a dagger instead of Thieves' Tools, adding your proficiency bonus to any ability check made to open locks and disarm traps as if you were using Thieves' Tools.

Hidden Blade

At 3rd level, your expertise in knife-wielding has extended to being able to hide them imperceptibly on your person and make attacks unseen. You are able to conceal a number of daggers equal to your proficiency modifier within your clothing that cannot be seen without the aid of magic.

Additionally, the first attack made by one of these daggers has advantage as it slips neatly from concealment into your foe's body.

Fistful of Daggers

Your mastery has advanced to the point where multiple daggers can be thrown in a single fluid motion.

When you take the attack action to throw a dagger, you can instead throw a number of daggers up to your proficiency modifier. Only one of these daggers can benefit from your sneak attack damage.

Bottomless Bandoliers

At 13th level, you are able to draw an unlimited number of nonmagical daggers for throwing and fighting.

Additionally, you can throw them in massive groups to overwhelm groups of enemies. As an action, you can cause all creatures within 10 feet of you to make a Dexterity saving throw or take 3d4 piercing damage, or half as much on a successful save. The DC of this saving throw is equal to 8 + your Dexterity modifier + your proficiency bonus.

Once you have used this feature, you cannot use it again until you have completed a long rest.

Devastating Follow Through

At 17th level, when you are wielding daggers in both hands and land a successful strike with your main-hand dagger, you may also apply your sneak attack dice to your off-hand attack.