Dagger Mastery

the dagger is a fast and nimble weapon, and your mastery of it shows how deadly and stealthy it can be. When you select this feat, you gain the following benefits:

• You gain a +2 bonus to attack rolls you make with daggers.
• You gain advantage on any Dexterity (Sleight of Hand) checks to conceal a dagger on your person.
• Once per turn, If you take the Attack action with a dagger, you can make an additional weapon attack against that target.
• Once per turn, you deliver a "Deadly Strike" and can deal an extra 2d4 damage to one creature you hit with an Attack if you rolled 15+ on the Attack roll or you can forgo the advantage for that roll to make a "Deadly Strike" . The amount of the extra damage increases by 2d8 when you reach 11th level and17th level (2d12).