【Wooden Fence】→【Stone City Wall】→【Sky Barrier】→...【Arrow Tower】→【Ballista】→【Italian Cannon】→【Destroying Heaven and Earth Cannon】......【Diesel Generator】→【Chemical Generator】→【Magnetic Generator】→……When the crisis comes the whole people travel through the doomsday world and face desperate challenges.Desperate drought terrifying acid rain monstrous waves meteors destroying the domain...No one can avoid it!And there are endless zombie attacks that follow.If