For decades, the governments of our world have been fighting a desperate and secret battle to keep hordes of alien invaders away from our planet. When the guardian of the United States falls, a new champion must be chosen. Sadly, the choice of a champion isn’t ours to make, and the Galactic Conflict Authority selects a human, seemingly at random, to lead the United States of America’s efforts at holding back the tide.

Zac was alone in the middle of the forest when the world changed... The whole planet was introduced to the multiverse by an unfeeling System... or God. A universe where an endless number of races and civilizations fought for power and dominion. Zac finds himself stuck in the wilderness surrounded by deadly beasts, demons, and worse. Alone, lost and without answers, he must find the means to survive and get stronger in this new cut-throat reality.

When Kers is reborn as a dungeon core, he finds himself stuck in the most improbable of places: a cloud. High in the sky and far away from the usual solid resources, Kers must face the obvious question: How is a dungeon to build itself without wood or stone? Luckily, Kers has the sarcastic (and sometimes helpful) fairy Selena to help him get his bearings. Together, the pair delight in exploring Kers’ weird existence, creating novel mobs, and enticing adventures to plumb the lofty heights of his floors.

Ilea likes punching things. And eating. Unfortunately, there aren’t too many career options for hungry brawlers. Instead, the plan is to quit her crappy fast-food job, go to college, and become a fully functioning member of society. Essentially—a fate worse than death.

Due to unusual circumstances, Randidly starts in an isolated dungeon far beyond his level, forced to rely on the mysterious Traveler Shal in order to learn and survive with the dangerous new status quo for his world. But survive he does, only to leave the dungeon and discover that while he experienced several hellish months in the dungeon, only half a day passed on Earth. Randidly's capabilities are now more than enough to help build a small enclave of survivors, but that doesn't mean balancing his sense of responsibility against the plots of an unfriendly town will be easy.

Ashlock wakes in the courtyard of a demonic sect... as a tree. A tree that eats people. An odd start to a new life. Almost as strange as the humans flying through the skies on flaming swords and challenging the heavens. After all, this is a world where humans could chase the goal of immortality through the art of cultivation. But Ashlock is merely a sapling in a desolate courtyard, left alone with his thoughts and unable to speak to those passing him by. Unless he does something about it.

The usual result of a human taking a runaway semitruck head-on is a very sudden, very fast track to the pearly gates. But for one newly noncorporeal man, there's another option: become a dungeon. Feeling sorry for the desperate angel assigned to him, the man relents. Heck, if it doesn't work out, he can always chat with Saint Peter about it later. Next thing you know, he's a dungeon. Admittedly, a small run-down, somewhat unimpressive dungeon (more of a house, actually), but you gotta start somewhere, right?

I died and was accidentally reborn as an [angelic monstrosity]. So now I'm building a holy dungeon-tower that is tall enough to reach the gods...so that I can complain about it! But the humans think that I am trying to destroy the world.

Somewhere in the toxic Bone Pits, where mechanical nightmares roam, an emaciated and wounded young wolf clings to life. Wracked with pain, driven by instinct, it crawls across the subterranean landscape, avoiding the unnatural horrors that dwell there and seeking sustenance while fending off rats, insects, and other vermin stalking it as prey.

Fight, survive, adapt, and rely only on yourself. That is Derek’s creed and what's got him through the System Integration on Earth. Everything changed when the System came. Cute bunnies and beautiful butterflies became savage killing machines. Then the Invaders arrived with a single goal: to obtain ownership of this new habitable planet. War has raged ever since. None of this mattered much to Derek, aside from making living a little more perilous.