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: 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

: He uses a rare item to briefly resurrect monsters as shields, allowing him to cast high-level magic without a traditional party. : 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 Eugene is a narcissist who believes his status

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. The Strategy Book: A Blueprint for Reality While

: Even minor details like what food a person likes or their secret motivations. The Path of Redemption

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:

If you are looking for this manga or its related light novels, you can find them through retailers like Amazon Japan or official digital platforms like Gangan Online and Manga UP! .