The Fall of Hyperion (1991)

The shadow of war has fallen on the Web. In the corridors of power on Tau Ceti Center, chaos reigns. Out of reach from the clashing empires, the artificial intelligences of the TechnoCore manipulate everyone and everything. And on Hyperion itself, where battle rages in the skies and on the streets, the mysterious Time Tombs are opening. And the secrets they contain mean that nothing—nothing anywhere in the universe—will ever be the same.