Donarathi

A race of Xenos that took part in an Imperium-led temporary alliance against the Tyranids of Hive Fleet Jormungandr. Seeing as to how the Imperial Commander turned on one of the races in this alliance as soon as the threat of the Tyranids was gone, the Cimmeriac, it's likely the Donorathi were also betrayed and murdered by the Imperium. Or rather, by this commander. Generally, the Imperium as an organization/nation doesn't betray aliens for the simple reason of wanting to brag about having the "moral high ground" and for propaganda purposes. More likely, the species that was attacked by the Imperium was already an enemy and the alliance was no different than a temporary alliance with Dark Eldar and the others in the alliance were ignored. Besides, one war doesn't make you friends or allies. No, I do not have a bolt pistol to my head. There is no Inquisitor behind me. Right, Commissar?