Argynvost's Needle (Level 17)

This blade, missing its matching counterpart, sits loosely in its scabbard. The emptiness a true assurance of the sword's twin, lost to the world. The expert craftsmanship and wealth of the sword are ever-present. It finds itself adorned with the symbol of the Order of the Silver Dragon.

Storm of Blades. You and any of your companions within 30 feet of you can’t be surprised, except when incapacitated by something other than nonmagical sleep. The weapon magically awakens you and your companions within range if any of you are sleeping naturally when combat begins.

Level 5. Each time you hit a creature with an attack roll using this rapier, it gets +1 to damage for each time you hit a creature with an attack roll using this rapier this turn. This damage bonus resets at the start of each of your turns.

Level 9. Each time you make an attack roll using this rapier, it gets +1 to hit for each time you hit a creature with an attack roll using this rapier this turn. This hit bonus resets at the start of each of your turns.

Level 13. The damage bonus in the Level 5 ability increases to +2. Additionally, you score a critical hit on a roll of 19 or 20.

Level 17. The damage bonus in the Level 5 ability increases to +3. Additionally, the attack bonus in the Level 9 ability increases to +2.

Proficiency with a Rapier allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: monk, Finesse, Vex