I pulled a random game with Yibb-Tstll as the Ancient One and Ghroth as the herald. An 11-doom AO with 2 on its track to start. Great.
The first Mythos card off the deck is...guess what? MYSTIC! Everyone loses a stamina.
Well anyway, I sent Jenny to the Bank to get a loan so she could shop for Elder Signs. She started with the Carcosan Page, so she could trade away all the cool stuff she could buy 
A few gates opened, and some of the other characters gathered enough clues to seal. Well in the first two rounds of shopping, Jenny bought Eltdown Shards, which removes a doom token from the track when read. A Mythos card caused everyone to re-fight a random monster trophy, awarding an Exhibit Item on success, and Dexter Drake nabbed a Parchment of the Elder Sign. That's another doom token down the drain! (Jim Culver got a Book of Anubis, and a bunch of investigators went insane and unconscious, keeping him quite healthy ;-D )
When Dexter got Amnesia (ARGH), I assigned him to monster duty. He had a Sword of Glory, Shrivelling, and Wither, so this was not a problem. Two monsters were put into Dunwich, right in front of the white/black arrow into a vortex. I decided to send him there. One of the monsters was a Mi-Go, which dropped an Elder Sign! Way to work around your Amnesia, Dex!
Mark went to the Witch House, where a silhouetted nude model asked him to paint her. He can't take a hint and blurted out, "I can't paint, lady" and she turned into a Hound of Tindalos and devoured him :'(
He was replaced with Marie Lambeau... who used her Witch Blood on the next Upkeep to strip yet another doom token off of Yibb!
Dexter went through the remaining gate with his Elder Sign. In his first encounter in Lost Carcosa, he encountered Mr. Skin, who offered to join him (take an ally of your choice). Of the 11 allies in the deck, I had a lot of good choices:
Tom Murphy's +2 Fight is always welcome, especially with Dexter's +1 Fight skill, which would make him practically froth at the mouth.
Zebulon Whateley's spell-refresh would be great.
Charles Dexter Ward's +1 to all combat spells would have been sweet.
Professor Rice would have replenished the waning clue supply, and there was no plan to fight Yibb anyway.
John Legrasse's +2 Will would have been welcome, as Dexter's natural Will is crap.
Erich Weiss: +2 Evade, +2 Spell, never be delayed. Quite alluring!
But the ally I went with, for the sake of being able to submit this report... William Bain: +1 Speed, +1 Luck. Remove 1 doom token from the doom track when William Bain joins you.
Ahahahaha! The next mythos card was a gate opening on a seal, and next turn Marie sang Yibb to sleep or whatever and removed a doom token, then Dexter cast Find Gate, returned to Arkham, and sealed the last gate on the board, while removing Yibb's last doom token.
Oh, and the terror level never went up, either. Even if it did, we had a Director's Diary to prevent it once
Score: 20. Terror Level: 0. Doom track: 0. With GHROTH starting Yibb with 2 doom tokens! This would have been a perfect game if Mark had not been devoured, but he gave his life for the cause (replaced with Marie).
