
Josh-o-Lantern |
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Everything about fighting Cthulhu can be summed up in this video

Lyra Amary |

Make them all level 20 and give them incredible wealth by level. Then laugh as they all get slaughtered anyways.
Mythic tiers or artifacts are the only things that can really compete with Cthulu. Even then, only a lot of mythic tiers or really strong artifacts will do it.
A level of 20th level characters, non-mythic can kill Cthulhu, easily. Though it obviously depends on optimization levels of the party.
Cthulhu really is not that hard.
Add in a single mythic tier, and well, Cthulhu can die in the first round. Mythic is absurd.

DoubleBubble |
level 20 with 10 tiers of Mythic. But don't throw Cthulhu at the outright, throw lots of horror and madness in front of them first. It will be interesting. Make them feel like they have choices, but at the end the don't matter. They will face Cthulhu no matter what. The true horror of Cthulhu is to make the players feel like no matter what they do, it will not matter. Have a lot of NPCs with them and they either go insane or die. The players will keep trying to protect them, but that will not matter, the NPCs will still die. And see how much resource they have left at the end. I think that will build up the boss fight rather nicely.

PossibleCabbage |

The best part of the bestiary entry for Cthulhu is the entry on "Non-Euclidean". I mean, Lovecraft didn't understand it either, but spheres (and every other non-flat object) is non-Euclidean; (e.g. sum of the interior angles of any triangle inscribed on a sphere must exceed 2π.) that space-time is non-Euclidean is a pretty important piece of 20th century physics. The will save for gazing upon great Cthulhu is appropriate, but probably not because of his geometry.
Now if he's not locally-Euclidean, that could be weird, but it would most likely mean he's pointy.

Boomerang Nebula |

The best part of the bestiary entry for Cthulhu is the entry on "Non-Euclidean". I mean, Lovecraft didn't understand it either, but spheres (and every other non-flat object) is non-Euclidean; (e.g. sum of the interior angles of any triangle inscribed on a sphere must exceed 2π.) that space-time is non-Euclidean is a pretty important piece of 20th century physics. The will save for gazing upon great Cthulhu is appropriate, but probably not because of his geometry.
Now if he's not locally-Euclidean, that could be weird, but it would most likely mean he's pointy.
I think you are probably right about Lovecraft not understanding non-Euclidean geometry. But what if instead it was the first postulate (instead of the fifth) that didn't hold in the presence of Cthulhu. Maybe where Cthulhu is concerned sometimes two points cannot be connected by a straight line. Or in other words from some points in space other points simply cease to exist. That would be freaky weird!

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Everything about fighting Cthulhu can be summed up in this video
That was an incredibly accurate and well-done video outlining the Mythos....I love it. My Gaming group rotates in Cthulhu mini-campaigns on a fairly regular basis and the realization that you aren't trying win but to survive and maybe help some others to survive is very different from our other games. It really adds a certain spark to the roleplay and makes you question who we are at the end of the day and how we would react if we were thrust into a real situation where that shadow in the corner suddenly sighed and blinked while we lie in bed.
As the video states, putting a lifebar on Cthulhu is a bad thing to do.....New Sean Bean Meme: One does not simply fight Cthulhu.