From publisher blurb: The Grand Stair stretches behind the scenes of the multiverse, The Doors upon its unfathomably vast span leading the way to gossamer worlds of limitless variety and infinite possibility. Some worlds teeter on the verge of apocalypse – and others are well past it. Hollow Thune has suffered more than its share of calamities – a genocidal global war, the fall of a decadent military empire, and the hollowing-out of most of the world by the all-consuming maw of Shadow. In these dark days, voracious Erebi bore through the planet like worms through a rotten apple, subterranean morlocks scrape for survival in ancient underground ruins, and defunct tyrants clutch desperately at the last drops of power. And so, reeling from the atrocities of war, trapped inside the crumbling shell of a dead world, hopelessly besieged by a merciless horde of reality-nullifying alien horrors, somehow... impossibly... life goes on.