A fallen star , which Tristran Thorne vows to find and bring to Victoria Forester. In Faerie , stars are living creatures. Yvaine appears to be immortal , but not invulnerable . She is pursued by the Lilim and the surviving sons of Stormhold, who want her for their own reasons. When Tristran realizes his love for her and abandons his courtship of Victoria Forester, Yvaine marries him despite their inability to interbreed.