Zack faced a difficult decision: should he use the powers he obtained to create magic weapons and sell them to increase humanity's power against the monsters or keep them for himself to always have powerful weapons at his disposal?
If he chose to create and sell magic weapons, it could significantly boost humanity's ability to combat the monsters. These weapons could be distributed among hunters, soldiers, and adventurers, giving them an edge in battle. By contributing to the defense efforts, Zack could help strengthen the human side and potentially turn the tide against the monsters. Plus, selling these weapons could earn Zack a substantial amount of money, increasing his wealth and influence.