Tsurugi Kyouran which ment Sword of Fury to those who knew Gamatsu and was translated to Furious Sword in basic, was a very strong, precise, and dominating style of lightsaber combat that was not recognized in the Great Holocron or by the Old Jedi Order. In fact, the style had no name till after 6 ABY, when the Templar Kev-Mas Colcha, brought several aspects of the unorthodox style together and gave it a name. The Style, primarily used by Sith or offensive minded Jedi due to its offensive nature, was very deadly, but surprisingly simple - so simple that it was difficult to learn for most. The form took advantage of the use of Greatsabers, using the size and raw power of the blade to their advantage, which also forced them to use simpler moves, due to the size of the blade.