The Bone of Barnacles is a weapon used by Grim in The Grim Adventures of Billy & Mandy and Codename: Kids Next Door crossover episode, The Grim Adventures of the Kids Next Door. It is used by him and Numbuh 1 to defeat the Delightful Reaper, getting Grim's scythe and Sector V back.
Use[]
Truth Telling: It reads Numbuh 1's mind and tells Grim that the Delightful Children have his scythe, due to Billy accidentally entering the Delightfulization Chamber.
Armor: It creates a large skeletal samurai armor. capable of battling with the Delightful Reaper and M.A.N.D.R.O.B.O.T. It becomes too strong after Mandy fuses with it.