The Kaiu Engineers are the most formidable crafters in the Empire, and their skills are turned almost entirely to the Crab Clan's duty of defending Rokugan against the Shadowlands. Masters of construction and siegecraft, they are also formidably talented at the manufacture of arms and armor. Many Kaiu also serve as battlefield commanders, turning their talents at siege to the service of war.
After the fall of Hiruma Castle, the Hiruma family had no sensei and was unable to preserve the knowledge of its ancient bushi school (the school listed in the L5R 4th Edition Core rulebook as “Hiruma Bushi”). Most of the samurai who actually knew its advanced techniques had perished in battle with the Maw, and those who knew its more basic methods were too focused on fighting and surviving to pass on their wisdom. By the time the family realized their school was in danger of perishing, it was too late.
Where the Hida Bushi School teaches endurance and strength, their Hiruma cousins teach avoidance and targeting weak points in an enemy's defenses with lightning fast strikes. The lessons taught by their sensei are essential to fulfilling their duties as warriors inside the Shadowlands. Those who do not heed their teachers well do not survive to perpetuate their mistakes. Those who excel at their lessons become a scourge upon the Shadowlands, moving through that dark realm with speed and grace, leaving death in their wake.
The practitioners of Kobo Ichi-Kai, whose primary dojo is located in Clear Water Village, focus on unarmed combat above all other forms of martial conflict. Although sometimes considered a touch bizarre by other Crab warriors, they are nonetheless respected because of their sheer physical power and ability to devastate virtually any opponent in hand-to-hand combat. Pragmatists make fine yojimbo, since they can leave their weapons at the door and suffer only minimal loss of effectiveness when doing so.
The Hida fighting style is one of the oldest and most respected bushi schools in the Empire, and one with a very basic premise: endure the enemy's attacks until you have the opportunity to crush him with sheer brute force. The style was shaped by the Clan's early years combating oni and other Shadowlands enemies, when only the strongest and most resilient among Hida's followers survived. The Hida Bushi School encompasses two broad themes: damage mitigation and heavy weapon use.