Story Question

I realized today that the story I've been working on is... not good. Too
much of the concept--which I like, dammit!--is (or could be reasonably
claimed to be) derivative of previously-published material, even with the
take on the idea I have. So I'm chucking much of the concept, keeping what
is wholly original, and rewriting some of what I have.

Current story question (and don't tell me this part is derivative--story
questions always seem that way even if they're absolutely not; it's a
formula for crap's sake!):

When undead legions begin to invade the Kingdom of Araan, mage Aeric
Firehand and his companions set out to discover who is behind the
invasion. But can he succeed when he finds himself facing an undead mage,
hostile tribesmen, and a traitor among his companions?

Let's hope I can make it work. I admit that I'm stealing a little from some
games I've been in or run, but that's no big deal, is it, Mr. Feist? ;)