Does this work

I had the idea for my next big bad to be like, the original vampire who had become “immortal” due to surviving for so long, but he’s actually just a lich, he’s used magic to disguise himself as a king after killing the king and uses magic to create a “daughter”, can I have the daughter technically be his phylactery, I wanna test to see if my players are, “evil” enough to kill the daughter to kill the lich, vampire, king