Xalatath is a entity possessing a dead elf how can we defeat her?

Literally as my tag said, Xalatath is possessing the dead body of the high elf Inanis, granted we killed Inanis at Knifu's encouraging words. But she was just bound to the knife. If the possessed body die dies. Like say we cut off the head. What happens then can't she just find some other body to posess I'm sure lorewise, there's gonna be bodies of adventurers in the final showdown against her. The only thing I can think of is Naaru lights smiting her to oblivion disintegrating her and Inanis. But with what we learned about Ethereals, how she no like them, in new raid, I stg I wouldn't be suprised if she suddenly becomes a antihero ally. Update edit: IM AMUSED AND HORRIFIED BY THE AMOUNT OF FEET COMMENTS.