crux successed to dominate serpulo, and came to earth.
Nations all over the world began to unite and fight.

They first attacked the high and low latitudes area, and we successfully destroyed the vanguards that landed in Australia and New Zealand.

But we've lost a lot of the northern part of Canada and the Bering Strait in Russia, and their vanguard has built Skyhook, which periodically descends its reinforcements.

There is no way to root them out, and we must now face endless enemies.