Border Post (chapter 1)

Zentrum. The hub world of the multiverse, surrounded by petals of other worlds, our own Earth among them. Zentrum was once powerful and advanced, but a global cataclysm stopped civilization dead in its tracks. Here, on the crossroads between thousands of different worlds and civilizations, men and women of the Border Guards stand their watch. And now a malicious force that vanquished Zentrum has Earth in its sights...