Rusalka's Bane

You have a +1 bonus to attack and damage rolls made with this magic weapon. On a hit, when thrown at a creature or object, the weapon bursts with glitterdust. Each creature in a 20-foot Sphere centered at the weapon's target must succeed on a DC 14 Dexterity saving throw or suffer the effects of the Faerie Fire spell for the next minute. Hit or miss, the weapon returns swirling back to the thrower's hand.

Vex (Mastery): If you hit a creature with this weapon and deal damage to the creature,[ you have Advantage on your next attack roll against that creature before the end of your next turn.

Light: When you take the Attack action on your turn and. attack with a Light weapon, you can make one extra attack as a Bonus Action later on the same turn. That extra attack must be made with a different Light weapon, and you don't add your ability modifier to the extra attack's damage unless that modifier is negative. For example, you can attack with a Shortsword in one hand and a Dagger in the other using the Attack action and a Bonus Action, but you don't add your Strength or Dexterity modifier to the damage roll of the Bonus Action unless that modifier is negative.

Thrown: If a weapon has the Thrown property, you can throw the weapon to make a ranged attack, and you can draw that weapon as part of the attack. If the weapon is a Melee weapon, use the same ability modifier for the attack and damage rolls that you use for a melee attack with that weapon.

Proficiency: simple, handaxe Source: Zamanora: Ballad of the Witch p. 201 (Homebrew)