: In one arc, he uses the guide to navigate high-stakes international business and state-level finance to fund his mission. The Hero’s Decadence
Rather than seeking simple revenge, Magnus uses this knowledge to become a "solo" powerhouse, reclaiming the agency he lost. He builds a new life based on efficiency and genuine altruism:
: He uses a rare item to briefly resurrect monsters as shields, allowing him to cast high-level magic without a traditional party.
: He commissions and battle-tests powerful golems, like the giant bear "Gladius MK," to act as the frontline Eugene never could be.
: Locations of rare items and the "optimal route" to defeat the Demon King. : In one arc, he uses the guide
Magnus is a brilliant sorcerer who has spent months suppressing his own potential to manage the fragile ego of the "Hero," Eugene. Eugene is a narcissist who believes his status as the "Chosen One" excuses theft and verbal abuse. Magnus constantly "gives ground" in combat—holding back spells and letting Eugene take the credit—just to prevent the Hero from throwing a tantrum. Eventually, Eugene decides Magnus is "useless" and kicks him out of the party. The Strategy Book: A Blueprint for Reality
While Magnus thrives, the "Destined Hero" Eugene spirals into villainy. Deprived of Magnus’s tactical support, Eugene’s incompetence leads him to threaten blacksmiths and even attempt to defect to the Demon King’s side for power. The story highlights a grim irony: Eugene is "blessed" with immortality by a god, meaning he cannot die until the Demon King is defeated—turning his heroic gift into a permanent cage for his own failure.
