For five thousand years, the False Prophet Azazel has been bound in chains of darkness in Dudael, a subterranean prison beneath the Antarctic ice. Now, Naamah-the immortal Siren who survived the Great Flood-has spent seven years drilling toward the site to shatter an archangel's seal and unleash him upon the world.
Sir Cian mac Morna, a 2,600-year-old Celtic knight kept alive by a sentient antediluvian sword, has fought a solitary war against the Nephilim bloodlines. But the rules of engagement have changed. Armed with ward-piercing munitions and heavy combat exoskeletons, Cian and his newly formed Tier-1 elite team must race to intercept the breach. Their operation will take them from a corrupted Watcher stronghold in the Carpathian Mountains, through a 5,000-year-old planar gate in Greenland, and into an annihilated bunker on Mars.
As celestial jurisdictions violently collide and the spiritual war bleeds into the material world, the Guardian and his team blind drop into an ancient subterranean killbox. But even with the most advanced tactical weaponry and a blade that sings with the frequencies of creation, Cian is about to face a devastating theological truth.
You cannot assassinate a prophecy. The eschatological clock has started.
His commission is not to prevent the apocalypse.