Prerequisite: Proficiency with daggers.
Instead of making a Dexterity (Stealth) check to hide yourself, you may make a Dexterity (Sleight of Hand) check—contested by an active of passive Wisdom (Perception Check)—to conceal your dagger. As an action, you may make a weapon attack with a concealed dagger against a creature that has not yet acted in combat. This attack has advantage.