Returning Javelin

This magic weapon grants a +1 bonus to attack and damage rolls made with it, and it returns to your hand immediately after you use it to make a ranged attack roll.

Slow (Mastery): If you hit a creature with this weapon and deal damage to it, you can reduce its Speed by 10 feet until the start of your next turn. If the creature is hit more than once by weapons that have this property, the Speed reduction doesn't exceed 10 feet.

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, javelin Source: Eberron: Forge of the Artificer p. 112, Player's Handbook (2024) p. 215