Ninth City Burning

"We never saw them coming. Entire cities disappeared in the blink of an eye, leaving nothing but dust and rubble. When an alien race came to make Earth theirs, they brought with them a weapon we had no way to fight, a universe-altering force known as thelemity. It seemed nothing could stop it--until we discovered we could wield the power, too. Five hundred years later, the Earth is locked in a grinding war of attrition"--