The protagonist's abrupt awakening as a dungeon core plunges them into a world of disorienting sensory input and the stark reality of "Core HP 1/1." Driven by a primal fear of annihilation, exacerbated by the shattered remnants of a "red crystal" and a destroyed wall, the newly sentient core rapidly deciphers its LitRPG overlay. It learns to deploy "roots" for stone, "eyes" for vision, and a "build/reclaim" menu to manipulate its environment. Early experiments with a "sticky trap" and "spike traps" yield biomass from rabbits and deer, providing crucial experience points. Through intuitive trial and error, the core unlocks "Control" by manipulating a door and "Alteration" by modifying stone, showcasing its rapid adaptability. A chilling discovery of a "breeding station" triggers an intense surge of lust, immediately reclaimed due to its unsettling nature and the core's burgeoning moral compass. The nascent dungeon, still fragile, attempts to hide its vulnerable core deep underground, constructing a new chamber. This fragile existence is abruptly shattered by the arrival of two Level 50 Flame Knights, whose casual destruction of its walls and search for another "crystal" reveals the existence of powerful external threats and the concept of "ANATHEMA." The core, helpless against their might, is forced to abandon its first entrance, relocating its roots and camouflaging its presence, realizing that survival demands not just growth, but cunning stealth against a world far more dangerous than it initially perceived.

A desperate fox-kin fugitive, Shayma Ell, Level 6 Seeker, stumbles into Blue's camouflaged entrance, pursued by hunters. Blue, battling the unsettling lust triggered by the breeding station's proximity to Shayma, strategically dispatches the hunters with traps, gaining a massive influx of experience. This encounter culminates in Shayma's willing, though desperate, bargain: refuge for her Queen's people in exchange for herself. This pivotal decision triggers the "Blue Core" skill, transforming Shayma into a "Blue Core Fox Spirit," immune to depletion, and establishing her as Blue's primary Companion. Crucially, this bond enables Blue's direct communication with her, ending his isolated, internal monologue. Guided by Shayma, Blue rapidly expands his dungeon, creating a mana dynamo with diverse Chrystheniums and tayantan trees, leading to his first Dungeon Level increase. His unique ability to cure depletion, demonstrated on Shayma, attracts the attention of Ansae Ziir, an ancient, powerful Primal Dragon suffering from severe depletion. Ansae's arrival, initially intimidating, quickly shifts into a pragmatic alliance, cemented by Blue's construction of a custom, luxurious lair, hinting at a new era of powerful, if reluctant, partnerships.

The mage-kings' summons to Council, demanding Blue's obedience and reparations, underscores the escalating external conflict. Queen Iniri, witnessing Blue's abilities, agrees to become a Companion, undergoing purification to regain her lost powers and immunity to depletion, further solidifying Blue's alliance. With Iniri's elite Classers and the newly recruited fourth-tiers, Blue prepares for an assault on Meil, the city held by Mage-King Vok Nal. Blue strategically tunnels to Meil, mass-killing Vok Nal's goblin and moil army with hydraulic pressure and fire traps, while the fourth-tiers engage Vok Nal's elites in a devastating battle within Blue's eastern farming chamber. This intense conflict results in Blue's "hangover" from the ANATHEMA instinct, a period of incapacitation followed by the absorption of the Meil dungeon core, granting him "Dungeon Conqueror" and "Dual-Core" titles. However, the victory comes at a cost: Yamal, a powerful fourth-tier, is completely depleted, his Class and mana ripped away, and Blue's own internal structures are severely damaged. The aftermath reveals a new, persistent threat—Armored Tunnel Crawlers—infesting the deeper tunnels, immune to lava and requiring new defensive strategies, forcing Blue to confront the unpredictable consequences of his immense power and the ongoing struggle for his own survival.

In the wake of the Meil conquest, Blue grapples with his internal damage and the disturbing realization of his ANATHEMA-driven actions. He convenes a critical meeting with Shayma, Iniri, and Ansae to explain his involuntary rages and the limitations of his unique dungeon core existence, particularly his inability to communicate directly or cast magic. This meeting, marked by vulnerability and strategic honesty, solidifies their alliances. Ansae, intrigued by Blue's unique properties, requests a piece of his core for study, which Blue, despite the pain, grants, hoping it will unlock his own missing abilities. Through continued experimentation, Blue discovers his illiteracy and the mental void that prevents him from writing or directly manipulating mana affinities, highlighting his inherent dungeon-imposed limitations. He also develops advanced metallurgy, creating the "Promise" Artifact for Shayma and witnessing Ansae forge the "Crown of the Silver Woe" from his Primal Sources, showcasing his unique material generation. As Shayma's parents arrive, Blue reflects on his identity as a "Power," navigating the complexities of diplomacy, resource management, and self-discovery, all while preparing for the inevitable confrontation with Tor Kot and the remaining mage-kings, his future intertwined with the fate of his growing kingdom and his extraordinary companions.