Depends on your magical aptitude and how you got your powers. If you got it from a white cat dog alien thing, you’re screwed at least for 100 timelines. If you were born with it (and bonus points if you saved a dying alien animal that’s NOT Kyubey), the worst thing that can happen is a green haired girl’s arm going through your torso and stealing your ball of magic. You won’t die though.

No, your torso is physically fine. It’s just your magic that’s been drained. Because she seeks salvation and she needs to fill 666 pages of a very dangerous book (can destroy 3 planets at the least amount) to get it.