I'm looking for either a word or phrase of when a rock has been weathered by sea water and has become very rough - to the point where its texture is so dangerous and pointy that it just cuts through flesh like butter. I want to use this description to ultimately describe a person. That they've become such that coming close to them you're so easily hurt.
Sample: "Now there is something different whereby them attacking me they actually draw blood from themselves. I've become [word]."
"Bristle" is not strong enough. "Caustic" connotes something acidic, which I don't want. Maybe something between "barbed" and "jagged" might work, but I was wondering if anyone had a better idea.