User blog comment:Neetaku/Grisha Yeager is Alive/@comment-3547740-20150721021523/@comment-4929778-20150822231130

The Shifter weak point is the head because of two things; one if u cut it when they are transformed it kills them and two theyre Titan shifting powers are stored in the spinal cord so if you cut it they are vulnerable. So for instance if Eren had his head cut off it would kill him so there's no way of bringing Grisha back. I think that Titan shifters are like the Titans in the sense that when they die they evaporate.