Crucible of Malediction var addthis_config = {"data_track_addressbar":true};

A Crucible of Malediction is a Dark Eldar device created using a process known only to involve the torture of captured Psykers. Once used, these spirits are released, and any psykers within the vicinity can be driven insane, or even killed by the psychic cacophany.¹

Sources

¹:Codex Dark Eldar 3E, p.14