3.5 adventure idea

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I'm planning on introducing the worm that walks into my campaign. The general idea is to have the players discover the existence of kryuss, but in order to defeat him, they will have to travel to the city of Dark Heart on the negative material plane and seek out the assistance of a certain lich who once was counted as one of his minions. I intend to use the basic outline above to explore the nature of good and evil and the importance of perspective. Right now I'm stuck on some plot hooks to get them there.

Also, I would beinterested in some suggestions for side adventures while in Dark Heart. Maybe something like the "Fistful of Dollars" trope between the various undead factions?

Any suggestions would be welcome. 
Next thing you will tell me Browbeat is bad.