In another world of Eden, due to the accelerated evolution, life had only been violent.

The First War had left only had full of survivors which they achieved the pinnacle of life - revive the Blood Goddess who sacrificed herself to bring down the Beast of War.

Only the dead see the end of war.

After the golden age, rivalry arose from both side failed to find the New Hope Frontier,  infighting followed. In an effort to end it once and for all, The Great Decay was unleashed, the dead rose.