Fluff And Stuff, Need help with fluff

So I've got my army and I've got my paint scheme. Now I need some fluff! Some motivation as to why I am playing these Tomb Kings. What am I fighting for? I have some rough ideas for myself but I could use some fluff building help from all you experts out there to help build up the specifics to a point where I'd be entirely happy with them. Now the first step as always is to assess what I've got, after that, we have lots of time to work out further fluffy little details. So first things first, we will look at my large scale view of Tomb Kings, then my force specific view, and then I'll open uip the floor for suggestions.

Step 1... How I picture the Tomb Kings...
Now, I'm not sure how everyone else here sees the Tomb Kings in their mind's eye, but the ones I imagine are a far stretch from the stereotypical 'The Mummy' idea which has become what I know most of my friends think of when they see Tomb Kings. No... I'm just not liking that stereotypical image of evil undeadness and one dimensional storylines.
What do I imagine then? Its hard to describe really... A powerful empire. Stuck in the past and animated by arcane powers. Mighty avatars of their gods and huge magically animated defenders wading through orderly blocks of undead warriors, going about their afterlives as though they were still flesh and blood, serving their king. there is so much to describe, that I just don't think I could cover it all. The closest thing I could think of is, historical Egypt... plus powerful magic.

I don't know if that helped anyone better understand my thinking or not, I hope that some of you on the site likely think how I do about them and will understand the idea of the whole not Hollywood undead cliche. In either case, its time to move on...

Step 2... Specifics to my army...
I don't have very much to go on. I still need to research and even play a few games before I'll know for sure. Hell, I don't even know the name of my Tomb King or his priest buddies... but I do have a little idea of what I'd like. Its just a matter of figuring out how to get there... here is what I'm thinking.
A hidden city - I didn't want my Tomb Kings to just be upstarty and 'in your face', it doesn't seem to suit them. I also wanted to incorporate their magic. Put the two together and you've got a walled city in the middle of a disorienting sandstorm. Plausible?
Location, location, location - I'd like it to be near a body of water, either in the North or the South of the Lands of the Dead. I'd need a good location of course... Perferably already a long way into the desert if you were to walk in from the lands of the living, and not too suspitious looking where someone might ask "why does that sandstorm never stop?
The King - I feel he's angry... otherwise why would he bother coming out of his invisible city at all? Perhaps some Empire thief took his liver? I'd be mad if someone took my liver. Anyways for whatever reason, he's pissed off and has unleashed his legions upon the world.

And that is that... now all I need is to smooth it out. figure out what needs improving and how to improve it. I've found that the best way to do this is have people ask me as many questions as they can, if I can't answer the question, then I know I need to work on it so...

Step 3... Ask me anything!...
Ask questions and leave comments for me to work through and help me smooth over my fluff!

First, decide what your king is like. If your king is complete tosser (Like mine) than his empire is going to be most likely evil or possibly really really manipulative, and likely out for conquest. If he's a nice guy (quite the rarity, it IS warhammer after all) then he is probably trying to destroy the vampires.

Either way, their society was based around death so their rationalizations for doing things might seem completely alien to other human nations. They might kill and mummify a band of mercenaries that they hired, as their reward for their aid. The Tomb Kings would see that as adequate recompense; the mercenaries would see it differently. They also like holding grudges. Take a look through the book, the kings go to war with the grandchildren of those who originally offended them. Every battle your Tomb Kings fight could be a revenge fight because the ancestors of the army you are facing...stood around in Nehekhara or something. Doesn't take much to earn the hatred of the Tomb Kings.

I recommend picking an existing city. Creating your own raises a lot of questions that can take forever to answer. Baghar and Rasetra are good, since there are very few kings mentioned in the book as being from there. They are also far enough away from Khemri to avoid Settra's iron (or bronze, considering their technology) fist.

I love the idea that you are pissed over someone stealing your liver, thats hilarious in a disturbing way, perfect for warhammer! Only problem: The city you thought up is hidden, if a thief could get in, then what happened that let him find the place? This is why I recommend finding an existing city. Simplifies things a great deal, allowing you to focus on the specifics more.

And remember, you don't have to ALL be from one city. My Tomb King has Zandrisian Archers, Slave-warriros that he won as tribute from battles against Zandri. And plenty of Quatarian Statues, since he is from Mahrak. Really, nothing is stopping you from coming up with tons of cool ideas.

P.S. Can I steal that idea of someone taking your canopic jars? I just love that idea so much.

EDIT: Gah! I just noticed when this thread was started. My bad.