My Arkham play group played through this scenario last weekend and had a great time with it. We got down to 1 last ally and were crapping ourselves trying to close the last two gates, which we did. I hope you all enjoy it as well.

Hark! The Coming of Lord Cthulhu!

Requires: Arkham Horror, The King in Yellow, Curse of the Dark Pharaoh and Innsmouth.
Setup: Arkham Horror board. Include Innsmouth board at your own peril.
Ancient One: Ghatanothoa (Cthulhu)
Herald: The King in Yellow
Guardian: Bast
Decks: Arkham Horror, King in Yellow and Curse of the Dark Pharaoh.

Investigators: Minh Thi Phan (must be chosen and starts with both copies of the Unique Item The King in Yellow. William Yorick, Patrice Hathaway, Ursula Downs, Bob Jenkins, Roland Banks, Harvey Walters, Carolyn Fern, Darrell Simmons.

Ally Deck: All allies; set all of them to the side of the board, shuffled.

Story: Too long has Lord Cthulhu been staved off from his rightful rule. The Great Old One Ghatanothoa, first born of Cthulhu, has maneuvered certain key elements in order to bring forth the Lord Cthulhu and usher in a new era of the Ancient Ones. By sacrificing a large insane population, a rift wide enough for Cthulhu to awaken and step through may be possible. Ghatanothoa will use The King in Yellow to drive the Arkham population mad and then send minions to slaughter them.

Special Rules:
• Place Cthulhu underneath Ghatanothoa, only the Dreams of Madness is in effect. Should all allies be devoured, Cthulhu awakens with a full doom track, replacing Ghatanothoa.
• Anytime an investigator can draw two Unique items, one may be an Artifact, even during setup.
• After investigators receive their random items, they must trade one of them for an ally.
• If an investigator would be devoured, they are instead Lost in Time and Space, draw a random Blight and an ally is discarded from the Ally Stack.
• Allies are discarded and a new one drawn from the Ally Stack when an investigator is: Lost in Time and Space, devoured, delayed in R’lyeh, suffer a wound or a psychosis.
• Closing a gate places two clue tokens at each of the related neighborhood locations without a gate.

If you would like the word doc for this.

What do you mean by an ally being devoured? Allies aren't devoured they are returned to the box, investigators are devoured.

What do you mean by trading a unique item for an artifact? There are no artifacts in Arkham Horror.

Where did I say an ally is "devoured?"

Egyptian artifacts/relics...kind of like a Unique item, but better, eh?

kewlfrogz said:

Here :-)
The scenario looks nice, just beware of the wording: you should use "Exhibit items" instead of "artifacts", "madnesses" instead of "psychosis", just to avoid confusion.
Anyway, thank you for sharing

Sounds fun. I'd like to hear how the playtesting works before trying it.

kewlfrogz said:

First special rule "Should all alloes be devoured" I think I know what you're getting at there though I think you meant Cthulhu awakes when all allies have been returned to the box. I might actually try this one out tonight though, seems an interesting scenario.

I am curious as to why you included Bast as a guardian here, seems a little out of theme and expands your requirements to needing to include Kingsport.