Judicium Imperator
From Lexicanum
The Judicium Imperator is an ancient method, and the last of a series of three tests (the others being the Ordeal of Inquisition and the Ordeal of the Holy Oils) used by the Grey Knights to determine the purity of a subject's soul. Because ordeals devised by Man can only tell so much, the Emperor himself must now be called upon to judge the strength of the subject's soul.
The Grey Knight and the subject engage in hand-to-hand combat, both unarmed and unarmoured, before the proper planetary authority. If there are more than one subject, then they will both fight the Grey Knight at the same time. Such is the martial prowess of the Grey Knight and the protection the Emperor bestows upon him that it is believed that only a servant of Chaos will be able to defeat him. In the event that the Grey Knight is bested, the guards will immediately gun down the subject(s).
