After his town is put to the sword and the children are taken to replace the fallen, an old man is out for revenge. He’s ready to fail at the most difficult challenge in the world: cultivation. Too corrupted to even take the first steps, the sly old elder simply agreed with those who told him that it was impossible. Then he quietly ignored them, rubbed his hands together, and started anyway.

It was a day like any other when suddenly the world changed. The universe reached a threshold humanity didn’t even know existed, and it was time to finally be integrated into the vast multiverse. A place where power is the only thing anyone can truly rely on.

Betrayed and left for dead by a group of slaving nobles, he thought there was nothing left but to bleed out as he counted the number of bricks on the ceiling. But fate had other plans.

For eons, conquering dungeons has been the most efficient way to become a strong adventurer. Although not everything is as straightforward as it seems. Several questions have always plagued the minds of those who enter these mythical places of power: why are there so many monsters? Where do the amazing weaponry and heavy gold coins come from? Why does the very air fill with life-giving energies? Cal has all of the answers to these age-old questions, for a very simple reason. He is a Dungeon Heart.

In the distant past, a time of magic and swordplay, there lived Harold, the mightiest lich of all, a master of arcane sciences, and a challenger of gods. After reaching the pinnacle of his power and finding it surprisingly bland, Harold waged a cataclysmic war against the gods, aiming to shatter the very system that confined him.

Lily Red, known as "Little Red", has trained her entire life to become a system-acknowledged scout under her Grandmother's guidance. Hunting, tracking, and trap-making—she's a master of her craft. But her dreams of joining the elite Scout forces are repeatedly blocked by a leader of the Wyld with a grudge against Grandmother. When Lily uncovers an impending invasion by Wolf Warband, brutal raiders from the frozen north, a deadly challenge offered by their war leader sets her pulse racing.

Arthur Cain was a hero to his city, the most accomplished and respected of the firefighters in his entire district. But when a call comes in from the so-called "Halfbreed Heights", the monsterfolk part of the city, Arthur's life gets flip-turned upside down.

The decision to start a new life is never an easy one, but for Joe the transition was far from figurative. Becoming a permanent addition to a game world, it doesn't take long to learn that people with his abilities are actively hunted. In fact, if the wrong people gained knowledge of what he was capable of, assassins would appear in droves.

Against his will, Thaden was transported elsewhere in a big flash of light along with millions of other Humans from Earth, to a place where they would train to become Contenders in a whole new world. Unfortunately for him, something occurred during his transference into the “Training” program, and he was ejected from the whole training process and sent into the open mouth of an active volcano for bodily disposal.

Eli "Nacho" Naches is a fearsome assassin who has lost everything in a post-apocalyptic world full of monstrous creatures. He knows where he fits in this horror show, and he’s only been hanging around to see what’s going to be thrown at him next. When he’s finally put in chains and sent to the chopping block, he goes readily...only to be unexpectedly sent back in time to his younger body with his memories intact and the chance to make a difference.

In a blink, I found myself in an unknown land, greeted by the textbox of an unfriendly system. It wanted me to become a great hero, save the world, win the love of the people and all that crap. But this new world already had a hero. Why should I bust my ass, deal with dragons and the unknown, for people I didn't know? Let him deal with that. It's his job! So instead of being tempted by the system's nonsense, I chose a simple class. Potion maker. I wasn't interested in cultivating mana and defying the heavens, courting death, none of that crap.

Digby Graves, a deceased medieval peasant with delusions of grandeur, is trying to figure out how the hell he ended up in Seattle eight hundred years after his death. Also, why does he have necrotic magic coursing through his zombified body? Added to that is the fact that he made a terrible first impression the moment he woke up by lunging at the first person that came into biting range. Now, the curse he unleashed is loose in the world.

After finding an abandoned, ancient fortress inside a focus, the Richters turn it into their headquarters and a training camp for their new army.

Nyx was born Hollow. An empty vessel in a world of spirits. Normally, that was a death sentence, yet somehow he survived. He's always been stubborn like that. He's also always been a bit crazy. Which is why, in another life, he did something reckless. He sent himself a message—his memories. Threw them into the Flow from which all spirits return. Besides, Nyx believed in asking hard questions. Like, was reincarnation real?

The clan of necromancers is busy doing what it does best: creating chimeras and killing the spawns of abomination. But others have made a profitable business out of these threats to the world. In addition to mutants, Max Richter must also confront human monsters. Good thing fighting monsters is his favorite pastime.

After his town is put to the sword and the children are taken to replace the fallen, an old man is out for revenge. He’s ready to fail at the most difficult challenge in the world: cultivation. Too corrupted to even take the first steps, the sly old elder simply agreed with those who told him that it was impossible. Then he quietly ignored them, rubbed his hands together, and started anyway.

Centuries before a certain dungeon first met a wise pink wisp, the world was torn apart by war. For a time, even the Guild was shaken to its core as a wave of necromantic cultivators surged forth from the dark corners of the earth. Garron feels the impact of war differently than most, as a servant in the estate of a Mage that left for the war. The young lord Andros and his servant have been left in the tender care of the ambitious cultivator, Jackson.

Lily Red, known as "Little Red", has trained her entire life to become a system-acknowledged scout under her Grandmother's guidance. Hunting, tracking, and trap-making—she's a master of her craft. But her dreams of joining the elite Scout forces are repeatedly blocked by a leader of the Wyld with a grudge against Grandmother. When Lily uncovers an impending invasion by Wolf Warband, brutal raiders from the frozen north, a deadly challenge offered by their war leader sets her pulse racing.

Recent college grad Sam King was hoping for a backpacking trip across Europe as a graduation present. Instead, he’s going to get a different kind of trip: a three-month stint in the ultimate immersive gaming experience. As a lifelong geek, gamer, and outsider, it’s a better gift then he’d ever dreamed.

The decision to start a new life is never an easy one, but for Joe the transition was far from figurative. Becoming a permanent addition to a game world, it doesn't take long to learn that people with his abilities are actively hunted. In fact, if the wrong people gained knowledge of what he was capable of, assassins would appear in droves.

For eons, conquering dungeons has been the most efficient way to become a strong adventurer. Although not everything is as straightforward as it seems. Several questions have always plagued the minds of those who enter these mythical places of power: why are there so many monsters? Where do the amazing weaponry and heavy gold coins come from? Why does the very air fill with life-giving energies? Cal has all of the answers to these age-old questions, for a very simple reason. He is a Dungeon Heart.

Rebecca Punzel grew up as an orphan in the slums, only daring to dream small by providing for her found family. In a kingdom where might makes right, and combat skills rule, her first class is practically a curse: golden locks of hair which require no care. Though she's in a hairy situation, she works tirelessly to build a modest life for the other orphans. At fourteen, every valuable in reach seems to get tangled into her curls. Practically overnight, she's blacklisted from working at any reputable business.

Snow Weiss was born to lead, her silver tongue a perfect counterpoint to her twin sister Rose's raw emotional power. Together, they were destined to bring prosperity to their kingdom as neighboring queens. On vacation at their summer home, the twins rescue a prince cursed into bear form. He makes a childhood promise to wed Snow that Rose scoffs at, knowing they may never meet again.

Eli "Nacho" Naches is a fearsome assassin who has lost everything in a post-apocalyptic world full of monstrous creatures. He knows where he fits in this horror show, and he’s only been hanging around to see what’s going to be thrown at him next. When he’s finally put in chains and sent to the chopping block, he goes readily...only to be unexpectedly sent back in time to his younger body with his memories intact and the chance to make a difference.

Millions of dungeons inhabit the planet, utilizing the Human people as a source of much-needed Mana to facilitate their own growth; in turn, the humans delve into the dungeons to acquire their own power in the form of Essence, which allows them to develop and enhance themselves in a multitude of different ways. It is a symbiotic relationship that has lasted thousands of years and has brought about a measure of peace.