The Red Sons of Sangheilios, also referred to as simply the Red Sons or the Bloody Sons to those who despise them, are a extremist Sangheili terrorist group formed some time after the Human-Covenant War. Founded by Nusra 'Nagon, a former SpecOps Officer and war criminal, they refused to accept the outcome of the war and they oppose the Sangheili's alliance with humanity who they regard as vermin that should be destroyed. They actively seek to undermine human-sangheili relations and incite war with the UNSC.