I'm very grateful for Noumenon's support.
Of course, now I need to take this thread to a higher CR.
With more information comes more plot twists.
1...The hero was losing. The desperate ritual just forced a two-millennium round break. Resurrecting the hero is only half the problem and may be very easy, but if the PC's don't back the hero up, he's going down hard.
Extra twists
a. The hero didn't/doesn't know he was losing and doesn't want to be helped.
b. Some of the forces of good still don't think the hero can win, even with the PC's help. They won't kill the PC's, but they'll throw up every obstacle they can find in the PC's way.
i. Subtwist of b: some of the forces of good want to make sure the PC's are tough enough to help the ancient hero in his fight. They want to throw up every obstacle they can to make sure the PC's "have enough experience fighting evil" to be real assistance (or maybe do the job themselves).
ii.Sub-subtwist of b. The forces of evil don't think the hero can win either, even with the assistance of the PC's. They'd like to see round three start, and will help the PC's in their quest. (You may not want to go this far down the rabbit hole)
Ultimately this leads to the following.
Q: What does it mean when a kyton is using aid another to shield a paladin from a guardinal?
A: It means you need more Sense Motive.
Recurring villains: anyone accused of heresy needs witch hunters or inquisitors.
Build Eberron's version of Solomon Kane or Gregor Eisenhorn and set the hunt afoot.
Stormborn is quite right about the two guys with guns, but I always like to know why those two guys are there. Extra points if it's directly related to something the PC's did, though young guns looking to become known as the fastest wand in the Marches can be very good for setting a theme.
I'd still be inclined to consider having one of the items being metaphorical.
You will, I believe, find the quote in one of Paul's letters...Corinthians?
Or, if you prefer psychic powers...the ancient hero was a soulknife (or psychic warrior). How, then, do we get his sword? Well, he passed his wild talent down through his bloodline: if one of his descendants became a soulknife, his presence would be sufficient for the ritual. (and helpful in any rakshasa-muggery thereafter). If you don't like psionics, you might try a duskblade, hexblade, melee oriented warlock, or spellsword.
Subtwists:
The PC's must find a young descendant and help him become aware of his true potential...possibly also protecting him from the army of Thrane, which is slowly being corrupted by an evil cabal. If you decide to do this, observe strict limits: you can either have a yellow warforged bard with high diplomacy or an airship obtained from the Lyrandar under dubious grounds informally nicknamed the Falcon. Not both.
Second subtwist: the descendant is already a soulknife. He's just not interested in being used as a component for a resurrection ritual.
Sub-subtwist: the descendant has good reason. His ancestor's soul needs a physical vessel...and he will be it.
Chew on those for a bit and let me know if more is necessary.