Upon reaching western Russia, the Cloven took over Moscow. On the day of their transformation and madness, known to them as the "Angry Night", the Cloven escaped westward. However, the Cloven have no known alliance with either group, and are hostile to both. The Cloven were able to hold on to their individuality to an extent, and as a result have traits of both Chimera (feral manners and cannibalism) and humans (speaking in their Russian dialect). Though the Cloven did not physically change into Chimera, the psychological stresses of their Chimeran condition drove the Cloven insane. Becoming as much of a threat as the Chimera, these mutated and insane soldiers became known to European intelligence, and began referring to themselves as the "Cloven". Gradually by September 1930, nearly 90% of the soldiers exhibited advanced mutations and severe insanity, with the majority deserting before banding together into small groups, roaming the Russian countryside preying on other humans. However, some soldiers began to exhibit erratic and violent behavior. The vaccination initially worked, as the soldiers demonstrated a strong immunity to the Chimeran virus and were more effective in fighting the Chimera. The Russian government, desperate to stem the Chimeran tide, ordered almost all surviving soldiers to be inoculated with Dr. Fyodor Malikov worked on using Pure Chimeran DNA that he had discovered from the site of the Tunguska Event and created an experimental vaccine which showed promise of resisting to the virus. From the very beginning Russia's military was inefficient in combating the alien threat, as thousands of human soldiers fell victim to the Chimeran virus and converted into Chimera. Beginning in 1927, the Chimera began their attack on Russia.