Tbh… MC could really become OP, just by simply relying on inventory skill…
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Not to mention that he’s pretty much the only individual so far with such an ability…
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All he need to do is to stock up all kind of weapons and bombs, pretty much turning himself into human turrets or…
He get his hand on nukes…
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As he pretty much can store even nuclear reactor inside his inventory, he could has unlimited amount of electricity to power up all kind of gadgets, from railguns, tasers, plasma torch, to super computers…