Seeking catacombs / undercity adventure

[VirtualMage]

Hi all, I'm running an irregular game at the moment which stitches together a bunch of my favorite adventures from all over the show. The PC's have been through DCC's The Portal under the stars, Souls for Smugglers Shiv and a variant of Whispers of the Vampires Blade.
The last looks like it will end up with the PC's chasing a vampire that has been compelled by an intelligent sword (and the newly minted vampires creator) to return the sword to him- he lairs in the undercity of a city state above, with his own network of spies.

I'm looking for an adventure (or adventure path, or adventure from Dungeon, or old D&D adventure- whatever.) that has a sizeable series of catacombs or underground city setting, preferably with some undead or ideally some puzzles to get through. The likely outcome of the chase is that the PC's will get trapped in the catacombs and have to explore their way out.
I have A LOT of adventures from many systems, but just drawing a blank on options, so thought I would throw the question out there to those wiser than I! Any suggestions welcome. =]

[Brother Fen]

There are several Kaer Maga adventures that are based in the Undercity that you could easily link together and modify as needed. Godsmouth Heresy. Seven Swords of Sin. The Asylum Stone.

[VirtualMage]

Excellent, thank you- I will read them through tonight. Any other suggestions?

[Jam412]

The 5th book of Carrion Crown, Ashes at Dawn is set in a vampire under-city.

[Haladir]

Shards of Sin and The Asylum Stone ("Shattered Star" #s 1 & 3)feature catacombs under cities (Magnimar and Kaer Maga, repsectively).

The Godsmouth Heresy features an ossuary beneath Kaer Maga.

The Worldwound Incursion ("Wrath of the Righteous" #1) starts out in the sewers and catacombs under the demon-besieged city of Kenebres.

There are any number of PFS scenarios that take place in dungeons beneath cities: look to the descriptions for guidance. "Rise of the Goblin Guild" and "Feast of Sigils" both come to mind.

[VirtualMage]

Thanks guys, I really enjoyed the Asylum Stone.
The Seven Swords of Sin has a few things I can steal, but seems pretty disjointed. The Godsmouth Heresy has some nice parts I can ninja too (I'd read this before, but forgotten where it was set).

I haven't read Shards of Sin, Ashes at dawn or The Worldwound incursion, but have them all, so will have a crack at these over the next week as I'm still crafting.

The PFS suggestions are excellent also, I'll have to have a look at my options there, but the above should keep me busy- it'll be a patchwork baby which you have each had a part in summoning through eldritch rituals. =]

[Jam412]

Have fun! Let us know how it turns out!

[J-Bone]

Isn't the latest of the PF modules set in part in the underdark? Down the Blighted Path, look it up.

[Brother Fen]

Seven Swords of Sin

Spoiler:

I recently finished running this for my group and made a few changes. I dropped the intro chapter and came up with another way to get the party to the dungeon entrance. Also, it is important to remember that the unifying theme of the dungeon itself, is that it was built by the mysterious Council of Truth. The Council of Truth was notorious for performing bizarre magic and chemical experiments and the entire group mysteriously vanished long ago.

The main plot of retrieving the Seven Swords of Sin is th3e driving catalyst of the dungeon, otherwise most groups would say "screw this place" and leave. If they don't have the goal of retrieving the artifacts in mind, it reduces Tirana to a random encounter at the end of the dungeon that may or may not be encountered.

[justaworm]

J-Bone wrote:

Isn't the latest of the PF modules set in part in the underdark? Down the Blighted Path, look it up.

Also, Book 4(?) of Second Darkness is all darklands as well as Book 5 of Serpent's Skull. I don't think the scale of these suits a 'catacombs' type adventure, though, the serpent's skull area would be close.