kenthompson , Shards of Earth, by Adrian Tchaikovsky.
There is a horrible unstoppable unknowable alien force, which 50 years ago you somehow got to stop destroying worlds by doing a mind meld with their moon-sized ship, but not before it destroyed Earth and disappeared, and now factions of humans and other aliens are at each other’s throats when the superbad alien ships return.
3 of 5 library cats 🐈 🐈 🐈
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