The Ryuha Armament Alliance is an organisation formed in the Land of Waves after the Fourth Shinobi World War by Shin Uchiha and his son. Following the example set by Madara Uchiha, the Armament Alliance seeks to change the world by exterminating human life and evolve into the next stage to bring peace, as in terms say the "survival of the fittest". Its members are powerful primarily rouge ninja and acts as the primary antagonistic force of the crossover series.
The Ryuha Armament Alliance is based out of a large, industrial village known as Walhert (Blood World Castle), which is a few meters away from the Land of Waves.
Main Article: List of Ryuha Armament Alliance Members