Star of War (http://ranmafics.com/Star_War/index.html) written by dragonlord lu and, disappointingly incomplete. In truth, the fic isn't really all that good. Dragonlord Lu isn't a native English speaker and it shows significantly through his writing throughout the whole way through. The story, in part, is a fair bit interesting more from its thematics of overcoming disaster than anything else. The plot, as it goes, is two fold: Ranma, early in the story, is banished by a magical artifact to another world. Meanwhile, Herb fails in a test for the royal family of the musk, unleashing a terrible demoness upon the world who promptly starts waging war for control of creation.
Lu, reasonably enough, makes a pretty interesting start on it. Predictable, the whole way through, but it interested me and was enjoyable when I last read through it. Unfortunately it does seem to be in permanent pause after the colloseum fight of chapter five. It's been a couple years, at least, since his last chapter and I don't know if anyone keeps contact with him.
Anyhow, while unfinished, it is a decent enough waste of an hour or two.
Dracos