Good idea in theory, but I'd be worried that this guy can bullshit in a lack of need to breathe. Remember, he already doesn't need to rest, sleep or eat.
.... why the fuck doesn't the princess's ability work on this guy? the car hitting him was a major chance to finish him off if they prioritized seizing his stone while he was 'dead', or at least nerfed back to human levels of bullshit. then even MC should've been able to overpower and hog tie his ass...
Are you kidding me? All that for a leg to throw away all that, how does she gonna live now ?
If things go this way all the characters will die before we get to the end.