Hydrogen Sonata (Culture Novel) UK

The Scavenger species are circling. It is, truly, the End Days for the Gzilt civilisation.

An ancient people, organised on military principles and yet almost perversely peaceful, the Gzilt helped set up the Culture ten thousand years earlier. Now they’ve made the collective decision to follow the well-trodden path of millions of other civilisations: they are going to Sublime, elevating themselves to a new and almost in­finitely more rich and complex existence.