Naenghyeol 

'It wasn't humans who stopped the Mongol advance in 1242.' The Mongols swept through Eastern Europe, causing a storm of blood. Wherever they went, only ruins remained. The blood shed by so many victims awakened an unexpected being...... The desperate Mongol commander-in-chief Subutai ordered a group of hunters to stop the unknown being. However, they did not know. That this was the prologue to a long war between humanity and the unknown being...... The beginning of the Anemia worldview.