how likely are u to actually die from taking an E pill?

i’ve only tried it once and only took half a pill. i honestly didn’t really like it because my body temperature kept going from too hot to too cold and it made me have quite bad anxiety at first. i don’t know how people can hack taking more than one. my brother took 4 in a day, and i have a friend that takes quite a few every time she goes to raves. but how likely is it that they’ll kill you?