So things were going as usual today, except we started slowing down when clues stopped appearing. Before we knew it, too many gates were open and Cthulhu had woken up.
"Ok, let's do this". Michael McGlen was blessed and unloading 10 dice per turn (Plus 5 clues on the first attack), Joe Diamond was rolling 12, Gloria 8 and Sister Mary... well, 3. Hey, she's a nun! We were blowing through 1-2.5 doom tokens per turn easily. Suddenly, the green giant went down.
Woah, what happened? Why haven't we ever done this before?
"Hey... we forgot his combat modifier..."
Yep, somehow that totally slipped our minds (Might have something to do with just waking up). Alrighty, we do the fair thing and set it all up as normal. This time things go much 'better', with all 4 of us being devoured and Cthulhu only losing 3 Doom Tokens by the end (Stupid regeneration...). It felt normal at least.
So, that's the sad story of how we thought we did something, only to be eaten moments later. How Lovecraftian. The moral of the story? "If you realize that you forgot the GOO's combat modifier, keep it to yourself".
. Merely closing them will get you a win if luck goes your way (many monster surges, few actual gates opening), but that's rare (happened twice for me in 72 games).