Survivor is technically a part of Butler’s Patternist sequence, except Butler disowned it. She also referred to it as her “Star Trek novel” for reasons which may soon become clear. I acquired Survivor via slightly sneaky means, in this case a pdf. file that I downloaded. The copy has a lot of typos and in general is kind of cruddy but still readable.
Here is an overview of the Patternist series. Once upon a time there was a powerful telepath named Doro and a powerful shape changer named Anyanwu. They got along like a literal house on fire by which I mean there was screaming and dead bodies.