Displacement gun

A displacement gun was, according to Miss Quill, one of the few weapons in time and space able to kill Shadow Kin. It did this by hitting both target and shooter, tearing the body apart in the process, and scattering it to the far corners of the universe, taking the Shadow Kin with it. Quill had one, but she wasn't allowed to use it.

She nevertheless tricked Kevin Williams into using it to destroy both himself and a Shadow Kin, and nearly succeeded in doing the same thing to April, were Charlie not to push her out of the way at the last second. (TV: For Tonight We Might Die)