At the book's end, Luke manages to kill Abeloth (supposedly for good) and relays the information to the newly-arrived Jedi force who later confirm that previously "deranged" Jedi are returning to normal.
At the book's end, Luke manages to kill Abeloth, but then finds her still alive in another body: somehow she is both. He relays the information to the newly-arrived Jedi force who later confirm that previously "deranged" Jedi are returning to normal.