How does one become "immortal"

[XenoMorph]

(07-07-2015, 07:47 PM)BFritz21 Wrote: I thought you could cut off an immortal's head to become immortal?

Nope you just gain their powers. the more heads you chop off the stronger you become. until there is only 1

But if you can cut the head off an immortal and they die were they really immortal to begin with?