Eberrron/Spy Game - Help with Story Arc

[Embrodak]

Hello, I need some help formulating the story arc for my new campaign.  It is set in the Eberron Campaign world with little deviation from the campaign canon.  As it is still basically a "spy" campaign so any suggestions are appreciated.
There was a great war that lasted for the last 100 years ending in one of the destruction of the 5 great nations.  The remaining 4 put aside their differences and signed a treaty ending the war.  There is now a period or peace, now in the coldwar with the thought that war could start again at anytime.

There will be two parties of 4 PC's each. One group is based out out Breland and the other Karrnath.  They will both be working for the spy agencies from their nations.

My over all thoughts are that an evil cult (the Blood of Vol) is digging up artifacts of power (Khyber Dragon Shards) that will unleash a great beast(I'm thinking a tarresque, but never stating that, nor ever actually ever needing to use it) to be used by the cult leader (Vol, an ancient Lich queen).  I read it in the Five Nations Supplement.  It is called Operation Leviathan.

Other powers are going to be:

The Nation of Droaam.  A nation of monsters is pushing a drug {dream lilly) through the 4 great nations.  I'm going to start the Brelish group to work with a local crime lord.  A new crime group has moved into the city, that is pushing the drugs.  Working with the crime lord they'll take down a cell or two and then get info on where their source is.  They'll then try and destroy the source in Droaam..  I'm thinking that is where they'll meet some of the agents of Vol and get some clues for the grander arc.

The Nation of Draguun.  A nation of goblins that have resurfaced into a united force during the last war.  They have lived for the last 10,000 years as shadows of the former goblinoid empire that spanned the continent. They are now uniting to bring their great nation back.  They are plotting to get the great war started back up and will offer their services as mercenaries.  They will try to get ingratiated to the nations and then pull an "Order 66", ala starwars and take out the high ranking officers.  I don't think the campaign will progress that far, but They may have a run in with a force from Darguun and perhaps uncover the goblins doing espionage and planting false information to spark then tensions.  Haven't figured out how to mix them in yet.

The Emerald Claw.  A terrorist cult working as patriots for Karrnath.  They are actually agents for Vol.  Are doing various schemes for the greater good of Karnath and Vol..  One overarching theme is Operation Leviathan where they are gathering the shards as I described above.

Lord of Blades: A crazed warforged looking to advanced his race in the world as the dominate race.  He sends his agents after artifacts.  Thinking that if I have some items the PC's are going after, there could be a rival group questing for it.

what am I looking for.  Suggestions on missions I can send people on..  It is a Play by post campaign so I want to have several short missions, unrelated or not,  where they find clues for the over all confrontation in Operation Leviathan.

[Elemental_Elf]

The Blood of Vol is a fast growing nearly mainstream religion. Vol herself is off in exile in the far north of Lhaazar. Why would they/she want to bring forth a monster such as a tarresque? Of course I could see the Half-Green Dragon/Elf Lich Queen summoning it to fulfill some ancient prophesy that can help her get revenge for what the Dragons and the Elves did to her family but, I'm curious what motives you give her. :)

Anyways as for adventure ideas, well ones involving Sharn, ships and contraband are always fun. So are missions where the PCs have to peddle dream lily to the poor and destitute, lol.

In all seriousness though, The Sharn Inquisitive is a great place to start for adventure hooks. Plus you can present them to your PCs in newspaper format, which will help them really get into the world :P

Oh and for the record, as an in-game devote follower of the Blood of Vol, I resent that you say my Church is evil! :P

[AllWillFall2Me]

Why would they/she want to bring forth a monster such as a tarresque? Of course I could see the Half-Green Dragon/Elf Lich Queen summoning it to fulfill some ancient prophesy  <Snip>

I think this right here can get the ball rolling on plot ideas. Unless you've removed/shifted her canon position, Flamwind the Sphinx resides in Sharn. Have her give some big prophecy about "twin rebirth of earth mover and earth shaker", saying that whoever raises the tarrasque will gain a great deal of power/revival of ancient glory (Parties interested: Darguun, Cyre, Vol, Blades (A return to the Xen'drik models of "perfection"), perhaps even the Chamber) This creates a feel of "ancient treasure hunt" meets "intrigue web", and prompts a huge series of adventures.

Ideas: The Monastery of the Unspoken Word in Aundair holds one of the oldest and most complete libraries of histories and myths in Khorvaire, undoubtedly a perusal of their library would shed light on the cryptic hints given by Flamewind. But how do Brelish agents enter an Aundairan monastery, and gain access to their innermost secrets?

Already agents from other teams are racing toward the same goals, all using different methods. What need does Karrnath have for libraries when it can call up people who witnessed the ancient binding of the beast, through necromancy or contacting an undead seer? Aerenal remembers the strength of the creature, and sends agents to stop the resurrection. Members of the chamber also remember, but what they think is as inscrutable as ever.

Thinking in terms of "what will they need to succeed, and where/how do they get it" can serve as the main drive of this campaign. If the head of House X has a needed relic in his mansion, how will they acquire it?

This is just my suggestions.

[Embrodak]

Thanks for the suggestions..  I forgot about The Sharn Inquisitive, and will scour through that.

I have intentions of having competing quads that will resurface, but didn't consider one from Arenal, so I'll include that.  I do like the idea of the Monastery and that would make a good mission trying to get in there.

As far as the overall story arc of the Tarresque.. That is actually from the Five Nations, on page 101.  I thought that it would make a good overall story.