Backlash Boomerang

This boomerang is made of bone. You can see a wavy pattern on the boomerang the same color as blood.

You have a +1 bonus to attack and damage rolls made with this magic weapon.

Bloodlust.  You can use your bonus action and spend up to spend half your hit die to deal extra damage on your next attack.  The extra damage is 1d6 necrotic damage for each hit die spent and the opponent will not be able to heal any damage dealt by this weapon, unless they succeed on a DC 16 Constitution saving throw.

Sentience.  Backlash Boomerang is a sentient lawful evil weapon with the intelligence of 18, a wisdom of 18, and a charisma is 18, it has a hearing and darkvision out to a range of 60ft.  This weapon can understand common & infernal, and can communicate telepathically with its wielder.  While you are attune to it, Backlash can understand every language you know.

Personality.  Blacklash is vicious and cruel, it will goad the wielder to slay all that dare oppose them in battle and will never be satisfied unless the opposer is dead.  Its goal is to slay those that forged it for a reason only known by it and will demand that the wielder to find the three that forged it and kill them.  It hates weakness and if the wielder shows any weakness then the blade will demand to be handed to another and will attempt to control the wielder if they do not comply.

Curse.  This weapon is cursed, and becoming attuned to it extends the curse to you.  Until the curse is broken, you are unwilling to part with the weapon, keeping it within reach at all times.  The only way to break the curse is by doing a 10 minute ritual, which projects your consciousness to the Astral Plane and summons the spirit of the boomerang (Physical stats the same as you).  You and the spirit must then do combat.  If the you win the curse's effect on you break and you may un-attune.  If you lose then the boomerang devours your soul.  All weapon attacks not made with this weapon are at disadvantage.  When you miss with a attack roll by 5 or more, the curse is activated. On that first miss and whenever you roll a 1 or 2 on an attack roll or miss with an attack roll by 10, the weapon misses and inflicts its damage, as though it had hit, on you.

The boomerang is a ranged weapon, and any creature proficient with the javelin is also proficient with this weapon.

On a miss, a boomerang returns to the thrower's hand.

Notes: Bonus: Magic, Damage, Combat, Cursed, Range