There is an elite and secretive school of warriors known for its ruthless method of training. Very few students (only around 10%) ever complete their training; this is because the training is often lethal. However, those who do leave the school alive invariably become all-but-legendary. Their very names strike fear in the hearts of their enemies, for their capability in violent ways is unmatched.
The school's masters are of the opinion that it is not possible to train competent warriors unless students are given first hand experience in actual combat; the training in inflicting death must actually involve killing, or else it is nothing but playing games. Therefore, all students must pass three tests: the Test of Iron, the Test of Darkness and the Test of Blood.
During the Test of Iron all students are divided in pairs. Each pair is put on an arena and both students are told to fight a duel to the death.
During the Test of Darkness all students are divided into groups of three. Out of each trio: student A is told to assassinate student B within three days by any means possible, student B is likewise told to assassinate student C and student C is told to assassinate student A. However, A does not know who C is, B does not know who A is and C does not know who B is.
The Test of Blood is the ultimate test during which the whole body of students is divided into two teams. Each student knows the team they belong to. Each team has two weeks to score a decisive victory against the other team. It is expected that leadership of each team emerges spontaneously. It is also expected that both teams engage in a game of espionage, since students may lie to each other about the team they belong to. Finally it is expected that an actual field battle emerges between both teams.
Does this idea make any sense, or is it complete BS?
It might make sense because: - Well, it does seem that such brutal selection would be the only way to accurately judge the capabilities of the students as well as give them necessary experience. Non-lethal training is indeed, by necessity, quite far removed from actual combat. (Note: "accurately judge" not in the sense that always those who die are inferior to those who survive - luck is, obviously, too big of a factor - but in the sense that a master watching events unfold from afar can see what everyone does. It can only be seen if one can act under the threat of death (and not panic, freeze etc) if one is actually put under the threat of death, etc.) Usually it is better to have much more, though slightly less competent warriors, however, if absolute elite is needed, then perhaps this is the way to train such an absolute elite, isn't it? (eg for a guild of assassins or whatever)
It might be complete BS because: - Well, did this ever happen in history? Because if it did not then it seems likely there are important reasons I'm overlooking that do make this absolutely implausible.