Newborn Dungeon Cores must choose what entity they help contain, and that choice determines what monsters they are able to summon. After being executed for crimes forgotten in death, Tira is given the chance to make that choice. Tira chose Acekorah, the Primeval Terror, a being so dangerous few cores will risk trying to contain it.

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.

After fulfilling the duty all Arch Necromancers are tasked with, the last thing Sylver Sezari expected was to be reborn. He was usually the one reanimating dead things, after all. How ironic. But reborn he was. And after crawling his way back into the land of the living, he finds himself in a strange land, a strange time, and with a strange floating screen in front of his new face. Either through plan or chance, he’s alive again, and planning to enjoy himself to his heart's content.

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.

If waking up in a new world isn't bad enough, Hestia starts her new life as a small, newborn dragon in a hostile forest filled with vicious monsters. With status screens obscuring her vision, her first task is to escape two hungry kobolds wanting some grilled lizard for breakfast. Equipped with fragmented memories from her past life and the gamelike mechanics of her new reality, Hestia must face trials, beasts, bosses, and more as she grows in size and power.

Ten years ago, Amelia woke up alone and lost in a broken world where she had to fight for her survival. Now, after reaching the pinnacle of power, defeating the Void itself, and escaping the abyss, she has finally found her way back into the real world. But instead of returning to Earth, she arrives in the land of Vacuos. A fantasy world with magic, monsters, Classes, and Levels. A world that is governed by a System like it were a video game.

She's unlike any one or any thing else: a Non-Standard Leashed-Intelligence Cybernetic Enforcer aka NSLICE-00P. The first of her kind, she's let loose into a universe of superheroes on behalf of her sinister masters to destroy all who oppose them. And everything's going according to plan—until NSLICE-00P gets hacked and sent into the past to kill her own creator before he creates her. Obeying orders as always, she wastes the poor guy. Unfortunately, there are consequences to initiating a reality-breaking time paradox. The most significant: total ejection from that reality.

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.

She wanted to be a Necromancer, but awakened as a Saint! Somehow her summoned heroes are all undead? How will the church react when their Saintess summons a skeleton in place of a mighty hero? Sofia isn’t too keen on finding out. In this world, Gods choose [Saints], and [Saints] summon [Heroes] from other worlds; everyone knows that. But Sofia had a thing for bones ever since she was a child; there’s only one [Class] she wants: [Necromancer]! When, by the whims of fate, she gets both classes at the same time, the system breaks.

A soul from Earth awakens as Seventh Princess Adelheid of the Vuldar Empire. With a weak body but a monstrous reservoir of mana that threatens her very life, Adelheid engraves an oath into her very soul. She shall seize the throne at all costs, but with ambitious cousins and discontent nobles, her father and brother are far from her only rivals. Experience Adelheid's journey through victory and loss to achieve her deepest desires.

Alexandra Rousseau, an engineer from the European Federation Star Navy with a past darker than the void between the stars, is unexpectedly launched into hyperspace when an FTL jump goes horribly wrong. She wakes in a world of magic and monsters, encountering a mysterious Order with plans millennia in the making. When the Order makes a catastrophic mistake, transforming Alexandra into a dungeon core, they inadvertently give her the power to bring back technology long since thought lost in this world.

Zaria was just a normal woman, living a simple life—until demons burst through her door and ate her heart. Reborn from tragedy, Zaria rises from the ashes as a Core, but with a twist. A rare mutation has turned her into a Mutant Core, destined to explode unless she forms a bond with a human witch to become a Striga. Her mutation? Legs. With the power of a full dungeon compressed into a walking house that is her body, Zaria sets out on a journey to find her Striga and avoid detonation. Along the way, she battles demons, builds her dungeon, and feeds her mimic mobs.

Upon awakening in an abandoned lab, Evelyn is empowered by a system that grants her bloody magical powers in exchange for finishing missions and consuming her enemies. She knows one truth: no matter the cost, she will advance. She'll manipulate allies and spread demonic corruption with a smile if that's what it takes to level up. Her first mission is to escape the lab's other newly born creations. But once she steps foot into the world outside of the lab, she must contend with people who forbid her existence and who will work to eradicate those with her powers from the face of the planet.

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?

Matt is reincarnated as a Tree. Not just any tree, but an overpowered one in a fantasy world that serves as the battlefield for an ongoing conflict between demons and the heroes summoned to oppose them. But Matt can be a great tool against the evil forces. TreeTree (as Matt comes to be known) will learn all sorts of skills, gain levels, and in doing so, build up a forest, train young subordinates, protect a village, and more.