User blog comment:Advancedwarfighter/Rant on Resistance 2/@comment-80.213.49.101-20170417162816/@comment-26432850-20170621105208

The Cloven were originally just Russian soldiers. When Dr. Malikjov started to test the Pure Chimeran DNA on these soldiers, something went very wrong. They became half Human, half Chimeran. When the Red Curtain was breached by the Chimera, the Cloven were able to spread across Europe.