Stygian Javelin

You have a +2 bonus to attack and damage rolls made with this magic weapon. When you throw it, it deals one extra die of damage on a hit. After you throw it and it hits or misses, it flies back to your hand immediately.

Curse: You're unwilling to part with this weapon while attuned to it. In addition, you have disadvantage on attack rolls made with weapons other than this one. Whenever you roll a 1 on an attack roll using this weapon, your target changes to your closest ally. If there are multiple allies, randomly determine which is the target. Make a new attack roll with advantage against your ally. If the attack hits, in addition to the standard damage you deal an extra 2d6 poison damage. Only the Remove Curse spell allows you to end attunement to this item.

Corrupting: This item corrupts. See the "Infernal Item Corruption" section.

Thrown: If a weapon has the Thrown property, you can throw the weapon to make a ranged attack. If the weapon is a melee weapon, you use the same ability modifier for that attack roll and damage roll that you would use for a melee attack with the weapon. For example, if you throw a handaxe, you use your Strength, but if you throw a dagger, you can use either your Strength or your Dexterity, since the dagger has the Finesse property.

Range: A weapon that can be used to make a ranged attack has a range shown in parentheses after the ammunition or thrown property. The range lists two numbers. The first is the weapon's normal range in feet, and the second indicates the weapon's maximum range. When attacking a target beyond normal range, you have disadvantage on the attack roll. You can't attack a target beyond the weapon's long range.

Proficiency: simple, javelin Source: Chains of Asmodeus p. 270, Player's Handbook (2014) p. 149