Council of Reeds vs Thanos
Prep war, both have 1yrs prep-time. No HOTI or other ULTIMATE device. IGs can only work on the scale demonstrated against the mad Celestials, no Galactus IG.
Scenario, The CoR have wiped all versions of Doom in the omni-verse, they have taken out Franklin, the mad Celestials and even 616 Reed and Valeria. Their appetite for 'correcting' the omniverse is only growing, they see it as their duty to make EVERYTHING right, and as such they have targeted "The Mad Titan" as their next task.
Thanos has been watching the curious omniversal disappearances of Dooms and has slowly pieced together the existence of an omniversal body. In doing so, he has sought to gather to himself some items of power and to ready himself for whatever chaotic threat is on the horizon. He learns of The Council Of Reeds once they wipe out 616 Reed and his family. He realises that they will inevitably be targeting him as he is a known universal annoyance and so now he is preparing for them as best he can.
One year of silence on both sides, passes... The Reeds decide to take the offensive, attacking from their hidden dimensional hideout.
What happens next? who wins and why?