The Weapon XI experiment was a project done by William Stryker folllowing the success and posthumous failure of the Weapon X experiment. Unlike Weapon X, XI did not involve a full body adamantium grafting, but rather only the insertion of two adamantium blades. The primary purpose of the experiment was the grafting of other mutations onto a Mutant. In the case of the experiment, Deadpool was chosen. While his only previous power were heightened senses, he was thereby given multiple powers. However, they were all temporary, proving the ineffectiveness of the project.