Jack wants nothing more than to be a mage, training alone every day cultivating mana in hopes of joining a guild. But when he encounters a dungeon heart in the forest and absorbs it into himself, his potential becomes boundless and bizarre. He is taken in by the enigmatic Lachlan Woe, a powerful mage who needs an apprentice, and begins his studies at the mysterious Shadow Tower.

Jack is an earnest, hardworking protagonist whose defining trait is relentless determination — he trains daily even without a teacher, and when given power he does not rest on it. His dungeon-core nature makes him a genuinely unique figure in his world, capable of absorbing and manipulating magic in ways that bend the rules everyone else lives by.

Across three books, Jack grows from raw apprentice to a force capable of challenging gods, his dungeon-core nature granting him powers that even his mentor finds astonishing. The series blends dungeon-core mechanics with classic mage-apprentice training, building toward a final confrontation that requires freeing an imprisoned deity and defeating the mages of the evil Nightvale faction.