Editing Purity wardens (section)

===Battle Brotherhoods=== 
During the final steps of the Recruits' Tournament the future Marines form associations that become the foundation for the battle brotherhoods – the smallest combat unit of the chapter. The purpose of this brotherhood is to for the marines to become as one, the unit more than just a sum of its parts. 

Eventually the marines completely reject their weak and pathetic emotions and individual desires in order to serve the main goal – extermination of the Emperors enemies without remorse, mercy or compassion, as cold and pragmatic as the winds of their home world.