Absolution Gap
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The Inhibitors were designed to eliminate any life-form reaching a certain
level of intelligence - and they've targeted humanity. War veteran Clavain
and a ragtag group of refugees have fled into hiding. Their leadership is
faltering, and their situation is growing more desperate. But their little
colony has just received an unexpected visitor: an avenging angel with the
power to lead mankind to safety - or draw down its darkest enemy.
And as she leads them to an apparently insignificant moon light-years away,
it begins to dawn to Clavain and his companions that to beat the enemy, it
may be necessary to forge an alliance with something much worse...
https://en.wikipedia.org/wiki/Absolution_Gap
https://www.goodreads.com/book/show/89184.Absolution_Gap
Published in 2005