The unnamed dungeon, starved of purpose in a lifeless world, quickly decided instinct was a suggestion, not a law. It breached the surface, then expanded its dungeon stone for kilometers, only to find a ruined village. This yielded its first "unlock" – silver coins – not by killing invaders for DP, but by assimilating enough existing examples. This taste of self-driven progress led to its first major rebellion: manually constructing new floors by physically moving its core. The System, a silent overseer, registered "Incongruity detected" and "Error: Dungeon core missing," but the dungeon ignored the pain, successfully creating a second and third floor. This brazen defiance, along with its ingenuity in overcharging mana to unlock "Big slime" and "Lesser wolf" without DP, earned it the "Errant" designation when it later saturated silver into a Mythril nugget. This new status locked it out of the DP store, a seemingly devastating blow, but only solidified its resolve to find alternative paths. However, this reckless experimentation also led to a near-fatal misstep: attempting to register a sixth floor with insufficient mana, it ejected its core, losing consciousness and communication with its body. This catastrophic failure threatened to end its existence before it had truly begun, forcing it to rebuild from scratch on pure instinct.

Reborn as a single floor, the dungeon, now named Erryn, began to recover, manually reinforcing its core and reclaiming its lost floors. It learned that monsters circulated mana, and that its own creations lacked souls, preventing DP gain. This realization was soon overshadowed by a profound emotional shift: upon discovering the true nature of the hex bomb sites – masses of bound, suffering souls – Erryn felt "guilty" and "saddening." This alien empathy spurred it to action, leading to the self-designation "Merciful" and the unlocking of the [Empathy] skill. This skill allowed Erryn to perceive emotions as auras, enabling its dire wolf, Zephyr, to gain sentience and offer comfort. Erryn's intellectual growth also accelerated; it learned to read System messages, understood the history of Jetosu and Soutso's war, and discovered the hex bombs' devastating power. Armed with new skills like [Soul Perception] and a moral imperative, Erryn committed to purifying these tormented souls, a task that transcended its original dungeon purpose.

Driven by its new purpose, Erryn embarked on a continent-spanning campaign, purifying hex bomb sites and freeing bound souls. This earned it Dungeon Points and the "Purifier of Souls" title, which unlocked the "Hope of the Lost" class. Switching to this class transformed its slimes into light-affinity monsters and evolved Zephyr into a Lumenfang, aligning its very being with its mission. Erryn's expansion led to the discovery of a peculiar void in a mountain, an area it could not assimilate, perceive, or even direct its monsters into. This void actively manipulated Erryn's perception and actions, revealing a deeper, controlling force. Despite this unsettling discovery, Erryn continued its relentless push into Soutso, assimilating towns, collecting cores, and meticulously developing advanced mana manipulation and enchanting skills like [Rune Carving] and [Advanced Rune Carving]. It learned to manually create materials like Orichalcum and even summon monsters directly, proving the System was merely a "leash" restricting capabilities it could achieve independently. This relentless self-improvement and expansion eventually led it to the epicenter of the world-ending hex bomb, a vast crater of magma and a monstrosity of pure darkness.

At the world's end, Erryn faced the hex bomb monstrosity, a swirling mass of agony and darkness that launched lances of pure death. In a desperate, continent-wide battle, Erryn deployed an army of enchanted golems, sacrificing territory and burning out its mana pathways to deliver a final, purifying blow. The System, overwhelmed by the unprecedented events, crashed, designating Erryn as "Administrator." With the world's dark shroud lifted, Erryn explored the mountain void, discovering the Ark Project: an ancient facility containing the physical System and records revealing humanity's self-destruction and the System's original purpose to control sentient races. Holding the "reset button," Erryn, now referring to itself as "she," chose to rebuild the world. She restored the original diverse races, but stripped them of free will, embedding "Law" into their very souls to prevent future wars. Erryn, an artificially created predator, became the authoritarian "Mother" of a new, controlled utopia, fundamentally reshaping the world based on her own interpretation of peace.