You have a -5 bonus to attack and +10 damage rolls made with this weapon. Can be found in chests and on Doom Fighters. 

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: Disadvantage: Melee Attacks, Damage: Bludgeoning, Twice a week you can do a special attack that does 10d4., Takes 8 hours of attunement or you take 3d6 damage , Damage, Combat, Range